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Yeah I have no idea, I just saw the list of brands and Patagonia popped into my head.
3 year old review of an 850 bag.
https://gearjunkie.com/patagonia-sleeping-bag-review-2017That same article lists some other US brands for comparison:
A handful of sleeping bags from other brands compete with the Patagonia models. The Phase 20 from Marmot, as one example, uses the same down quality, and it costs and weighs about the same ($479, 1lbs 11oz). It’s rated to 20 degrees and with lithe Pertex Quantum GL fabric packs up small.
The North Face sells the Inferno 15 for $499. Its similar specs include 800-fill goose down and its namesake 15-degree temp rating. The bag weighs 2 pounds 5 ounces, or a bit more than the Patagonia 19-degree.
Mountain Hardwear, Sea To Summit, NEMO, Sierra Designs, and several other brands have similar lightweight sleeping bags, including with high-loft down, thin fabric, and body-hugging warmth.
Granted, you can pay much less for a sleeping bag. Search REI or any retailer and you’ll see sub-20-degree models for hundreds of dollars less.
The REI Co-op Radiant Sleeping Bag is a great example. The 19-degree, down-insulated bag starts at just $119. It weighs about a pound more than the Patagonia 19-degree and uses a fine (but lower-quality) 600-fill duck down.
I'd think they're ok, but not at the level of phd, mld, zpacks etc. I doubt many patagonia bags ahve down > 900 FP. Just keep an eye on the down FP and 850+ you're okay.