I’ve been researching down sweaters as well, so I thought some feedback from me might help, but I am not directly familiar with either garment.
Perhaps like me, you are suspicious about REI delivering a down sweater with 4 oz of 850 fill, treated down at that weight and price point. Getting to 12 oz with 4 oz of down does not appear to be especially difficult with careful material and feature selection.
The only REI Magma jacket I am seeing on REI’s web page is a women’s version on sale at a great price ($110). if $$ is a concern, that appears like a superb value on paper.
REI apparently isn’t publishing the fill weight, but the Q&A section references fill of around 4 ounces – one indirect reference to Switchback travel (which I wouldn’t rely on simply because it is indirect) and another estimate apparently directly from an REI respondent, indicating about 3.9 oz. But they do not quote the down type or fill power in that same response, but the product description states 850 fill. Made in Vietnam, so maybe they can pull off the technical specs at those price points…. Plus, Switchback travel is reporting the venerable Ghost Whisperer 2 as weighing 8.5 ounces with 3 oz of 800 fill…so if MH can do that, you’d think REI could achieve 12 oz with 4 oz fill. Big difference in pricing though….
I believe in handling garments. As an example, I actually bought (ordered) a high end down parka from Feathered Friends once that was loaded with pinfeathers. Buyer beware. If the fill seems good, and you carefully feel the down throughout and are satisfied about how the down feels and what the loft appears to be, along with fit and features, then I would suggest you consider the REI.
Unless you re-sell your clothing, you will, or should be, “stuck” with a down garment for a long time so you might as well like it…. It shouldn’t wear out like a synthetic jacket. My down stuff lasts forever….
You might look at something like this as a more expensive frame of reference for “what is possible”:
https://backpackinglight.com/goosefeet-down-sweater-review-first-looks/
REI Magma: Here is an excerpt from the REI Q&A section:
lilbaer
· a month ago
What is the fill weight for this jacket? Also, does it have a DWR coating on it in case it starts raining/snowing?
1answer
Answer the question
REIservice
· a month ago
The approximate fill weight is 3.9 oz. and the face fabric is treated with a DWR.