I used to have a Sony widescreen CRT HDTV that I bought new, waaaaaay back when (about 15 years ago). It was early days of retrogaming for me, but I tested my VGA-SCART cable with MAME on it and it worked - except that the picture looked "OK but a bit crap" compared to other CRTs I was using at the time, so I didn't take it any further. It was early days of emulation for me, but my impression was that it took the 15khz input, but squeezed it into some widescreen mode.
That TV was stolen from me not long after (2006 I think), so I didn't get to test it any further. I replaced it with a 2nd hand Grundig 31" CRT 4:3 ratio and was very happy streaming my video and games content over the LAN to that (mostly my kids used it for playing old PC kids games and watching videos over the network using a PC version of XBMC, in the days before media server PCs were a thing).
Now that I think about it, the Sony HDTV getting stolen might have been a a good thing