I don't tend to test lenses for sharpness per se, only if I clearly see an issue. Just processing photos lets me know if the lens is sharp or not so there's no need to test specifically.
I generally test lenses for decentering (although I haven't done with the Sammy 45mm), and in the good old days of DSLR I always tested lens for front/back focussing. On this subject I happen to notice that the 45mm f1.8 was set at -1 micro adjustment when I attached it to the dock, and when I ran the update it was still set at -1. It makes me think this is the default setting which is very odd
CFexpress type A aren't the same size as SD cards, but they do share the same slot. In terms of shooting I haven't seen any difference between using UHS-II SD cards and high speed CFepxress A, even burst shooting wildlife or motorsports. The A1 does have a good buffer though.
Where I have seen a difference is transfer speeds to the computer, assuming you have a card reader capable of fast transfer speeds. I've just bought a type 4.0 reader (40gbps) and using the Pergear Master CFexpress Type A (1760 MB/s read, 1600 MB/s write) transfer speed to my Mac is rapid.