Share your experience!
U can try Orzly Flexislim that's really slim and let access very easily to fingerprint
I've it on my Z5 and I've got no problem to access it
It let you see all the beautiful lines about your Z5 then.
It's the best advice I could give to you
U can look for it on Amazon
It's also cheap.
I bought myself a Spigen liquid crystal case for my Z5 and it's great. It's transparent, lightweight and all of the buttons are easily accessible, including the fingerprint scanner.
http://stores.ebay.co.uk/SPIGEN-UK-Store?_trksid=p2047675.l2563
EDIT: Ignore me. I misread your post and Spigen doesn't sell compact cases. D'OH.