Originally posted by distudio It's plain to see the degradation of the sensor over this period in the form of additional noise.
No, what's plain to see is additional hot pixels. Furthermore, most of these are probably not true hot pixels in the sense of being permanently stuck on, but rather, ones that become evident only in the extremely artificial conditions of the test (these appear to be shots take with the lens cap on in a 30 second exposure). And indeed, temperature and battery condition may well be playing a role there.
As I expected, noise in the classic sense appears no worse - if anything, perhaps slightly better - in the more recent shot. To the extent one wants to judge noise in such an artificial test anyhow.