I've been on a pillow quest for a long time. I don't like the inflatables -- someone described it as 'sleeping on a balloon' and I agree. I sleep on a down pillow at home, so I *invested* in a WM Cloudrest but it wasn't thick/firm enough for me as a side-sleeper. Not exactly UL at 4.6 oz either. I tried the pillow case stuffed with clothes route but that felt too hard and lumpy. My favorite was the old Thermarest foam-filled one that I have for car-camping, but it's also a whopping 7oz.
I think I've come up with a good DIY solution. I made a "hybrid" with a pillow part filled with about a 1/3 of the foam pieces out of the Thermarest pillow, with an attached sleeve that will hold my puffy jacket. I used 1.1oz nylon and lined the pillow half with a piece of Primaloft (or Climashield, I can remember which it is) so that it's not lumpy from the foam pieces. I faced one with cotton since I prefer it on my face. Pretty happy with the results. Weighs 3.3 oz.
Top pillow (silver) has my Montbell down inner stuffed in it, the bottom one is pillow only (unstuffed), showing the back pillow case part.