OK, that shows me that Sony is upgrading their kernels, so I will eat crow on that one. I didn’t do an internet search for them, although I should have since they do publish the AOSP source for their phones.
Sony currently represents 0.24% of global mobile web browsing market share, according to StatCounter, with 5.5% in Japan, 0.44% in Europe, 0.04% in N. America and 0.06% in S. America, so it is no longer a significant vendor except in Japan.
I encourage everyone to keep posting their Android kernel versions on the other thread to find out if there are any other Android phone manufacturers doing the same.