@b-lilja A very nice write-up. I'm a 7x fan, and I've always wished my 8x20 Ultravids were a 7x20, and that my 8x32 Ultravids were a 7x32!
At first blush, after its "just right 7x21 size, the Curio's best improvement over the Ultravid are the screw-up eyecups - this is a feature that improves on the one little gripe I have with the 8x20 Ultravid and its push-down/pull-up eyecups.
An observation and question for you - the ocular cover (rainguard) for the Curio looks useless in the field for actual use. It appears to only really work when the binoculars are folded for storage, which seems rather pointless. This is in contrast with the Leica's single-fit eye cups which actually work well when the binoculars are in use, or in storage. I really require an ocular cover in the field, and am wondering, since you have both the Ultravid and Curio, if you'd see if the Ultravid ocular covers fit the Curio?
Also, do you happen to have a digital scale you could weigh the Curio's with its neck strap and ocular cover?
Kind Regards - Brad