How are the new games?

I’ve just become interested in the 2-d fighter when I played SSF2HDR and SF4.
When I had these games I was told they were incredible, now that KOF and BB are out I’m hearing they’re LOADS better. Are they? because I’ve been investing a lot of time into SF4.
Are the games anywhere similar enough that at least some of the skills I developed in SF4 and MvC2 would help?