Happily running Sailfish here on Xperia. Flashed from Linux. The main issue I had was to be aware of the difference between flash mode and fastboot mode (Volume down and Volume up). Some guides mix it up.

Edit. The first problem I had was that shop.jolla.com complained that I was in the wrong country on my cable internet! I had to share internet connection from a phone to buy and download. I hate geo restrictions because they do not work!