>>4108863>>4108872The only pancake in that range is the XF 27mm (40mm FF). The new version has WR and aperture ring but there's an older version that can be had for cheaper without WR/an aperture ring.
The TTartisan version here
>>4108852 is surprisingly good for the cost. It may end up being the best option for you.
Non-pancake there'd be the Fujicron 23 f2 (35mm EFL) which is small with fast AF, WR and capable.
As for around 90mm EFL we're kinda spoiled with the new 56mm 1.2 (85mm EFL) but it's probably overkill if you're getting a 26mp body. The older versions of the lens are coming down on the used market.