I went from the 10 to 14 and that was a massive improvement. Highlights (the brightest areas on a scene with both very dark and very bright spots) were massively overblown on the 10.

It’s much better on the 14, for example, although you can still tell the parts that would have been overblown previously, especially with HDR mode on, and I don’t love it — but at least you can still see some detail now.

Was 12 to 14 an improvement? Don’t know - didn’t have a 12.

Is the 15 improved from the 14? Until I get my hands on it, I couldn’t say. It’s just a lot of marketing right now.