Yes, fit is one of the best parts for sure.
Re:jestream. I haven’t owned one personally but have messed with a few. It’s much lighter, and fully glued construction with no sewn parts. Cuffs are nice and low profile. There’s tape on the interior micro fleece on critical seams. No membrane is biggest difference from the Sitka jacket. Hood is the typical dead bird storm style, cinches down quite well. Definitely a less bulky approach to a softshell, high stretch and more breathable than a jetstream.