The weights are pretty comparable:
Impertech DLX is 30 oz
Sitka Stormfront is 24 oz
Kuiu Chugach is 19 oz
Kuiu Yukon is 29.2 ox
Don't have access to my digital sheep gear list and too lazy to look for the hard copy
IIRC 15 oz for FT jacket and about same for RL pants
A few ounces here or there doesn't really matter on the approach , really no biggie whether you're toting in 50 or 60 lbs
It's when you score a ram and are hauling him out with your gear that you start looking hard at every ounce and gram you're packing
At least that's how it went for me