So here are my thoughts on the differences between the Flex 30 and EE 30°. I’ve had EE quilts for about 2 years, and just picked up a used Flex 30 here recently.
Of course, there are obviously loft differences between the two, but you should really compare a Flex 30 with an EE 20° quilt. In 900 fill power, each would have 12.3oz (flex) and 12.89 (EE) of 900 fill down. (reg length, wide) and have a $70 difference between the two as of September 2016. The flex would weigh 2oz more than the EE 20°.
That aside though…I still think the flex 30 would be warmer than the EE 20. Mainly because of draft mitigation and perceived width.
Now…if you have both unfolded…the widths are about the same ->

Here, its hard to see but the katabatic is actually wider than the EE (EE is green) by the head/shoulders, then tapers more than the EE near the hips (so EE is wider at the hips). Effectively though…the two quilts are made/sewn to be the same width.
You’ll also notice that in size regular, the EE quilt is about 4-5″ longer ->

However, due to the way the EE’s footbox is made, when its closed in quilt form, nearly all of that “additional baffle” gets used up in the “cinching” of the EE quilt and the quilts are much similar in length in quilt form. This pic shows the superior Katabatic footbox with footbox baffle..the Flex has a more square footbox whereas the EE tapers to a close.

So, as stated in my post above…I’m 5’10.5″ and both quilts come up to my eyebrows when lying on my back.
Anyway, I was most surprised at the difference in how wide each quilt actually felt in use….when having both strapped nearly fully closed on each pad…the EE felt much wider….too wide for my 170lb body. I was feeling more cold than I should have in my 30° EE a couple of nights on the trail…so got the katabatic, but I believe its b/c it felt too spacious inside and I had some trouble with drafts some nights.
After thinking about it a while, I believe that the Flex feels less wide and minimizes drafts due to a combination of many small factors….which all combine to make the Flex warmer.
- Flex uses cord to attach to the pad…EE uses elastic grosgrain. I think the elastic grosgrain is definitely less abrasive to the fabric and easier to put on/off the pad, but ….it flexes. So if you lift up and turn over to your other side, the EE might “move” an additional few inches over the flex.
- The actual pad connectors…the katabatic connects very close to the actual quilt fabric…the EE’s buckle is about an inch away from the strap. Then….times by 2 for the EE and the quilt is effectively 2 inches wider than the flex…but not in a good way b/c its possibly creating 2 inches of draft at the pad connection.

- The katabatic’s footbox zipper is 10″ longer than the EE….so the “quilt” area is 10″ less. Both quilts use 4 buckles (1 at the neck, 2 pad connectors, and 1 closer to the zipper). The 4th buckle on the Katabatic is actually an adjustable grosgrain strap, the EE’s is a snap buckle. The EE actually has a 5th buckle right at the zipper which the Flex doesn’t but I don’t think the katabatic will come unzipped by itself. Anyway, since the Flex’s “quilt” area is smaller, the buckles/pad attachments are closer together, meaning less chance for the quilt fabric to raise up in an arc and create a draft entry.

- The flex has elastic around the quilt opening….again decreasing the amount of “arc” in a draft…it pulls the fabric down/closer to other attachment points.
So…since the Flex can’t “lift off” the pad as much as the EE….it then feels less wide (in a good way for me), and blocks drafts better.
Combine that with the neck baffle….and you are really getting warm in a Flex.
I do have to say….I didn’t really believe other forum comments that stated how good the katabatic look and feel was over the EE. I was perfectly happy with EE’s construction quality before. But….now comparing the two side by side……I am a believer. The Katabatic just feels more like a retail product….the branded storage bag, tags, booklets….and the sewing is incredible….its just more “finished” than EE.
I also wanted to try the Palisade….because it should be even warmer than the Flex because of the differential cut, but the additional $100 is harder to swallow…plus you lose blanket functionality (though…I’ve never unzipped a Revelation out in the field). I talked with Katabatic and they said the Flex doesn’t have a differential cut b/c it would look odd in blanket mode and ….it takes much longer to make a palisade than a flex b/c of the cut….so they wanted to offer users a cheaper option.
One other thing I don’t get…..is why the 850FP Flex 30 is $10 more expensive than the 900FP. EE’s 850 down treated in 20° is $50 less than the 900FP option….not sure why the difference there…
Anyway…so far….extremely impressed with the Katabatic….and to me…the extra $$$ and 2oz is worth it so far.
I do have to say though…that the Katabatic has the same problem with the neck drawstring that the EE has….so I will be sewing on a loop just like I did with my EEs….I show that here ->
https://backpackinglight.com/forums/topic/incessantly-annoying-quilt-drawstring-in-face-problem-possible-solution/#post-3400544