A couple of days ago a leaked image surfaced claiming to be of both the upcoming Sony Xperia Z5 and the Xperia Z5 Compact for the first time courtesy of @vizileaks. You can more clearly note the fingerprint scanner on the right side of the phone and the lower-placed volume rockers.
Obviously don't forget that these images may not be the real deal. That said, the two Z5 devices are probably going to get official at an event on September 2, so the fact that they're leaking now isn't at all surprising.
Source: Twitter