I have a Zeiss 4X32 on one of my Encore barrels. It is a bit larger than some others. Its clarity and eye relier are exceptional for near-sighted wearers with glasses like me. I will probably buy another.

Its been a while since I had a Leupold 4X and I can't comment on the FX-II. I have no experience with Schmidt & Bender.

Cheers,

GrimJim