After the factory case on my Xperia Z5 fell apart I purchased the casemate case for this model. It is not as bulky and tight as the last two but seems to be as tough.
The case exposes the power button that is the Fingerprint sensor but could leave a little more space to get your finger onto the button for it to be read. The photo shooter button is not as sensitive with the cover on compared with the cover off. These are the compromises that come with a tough case on a phone and I am willing to accept these things. The case is so much better built than a cheap case that I bought from this site whilst waiting for the Sony case to arrive initially. I recommend this case but get one of these new screen protectors as the glass is exposed and that is a critical weakness with any of these types of cases that don't cover the front of the phone