Snowpeak down coats are nice but not sure their jackets are at a cheap price point...even in the sale you're talking a couple of hundred, so maybe 3 times the uniqlo.
I consider a down jacket one of those things you hopefully only have to buy once or twice so I wouldn’t fret about Snow Peaks prices, honestly they’re on the low end of what I would pay and I can’t afford golf.
Do you have access to Snowpeak? I think they’ve always done good value for quality stuff.