In the right environment, the SVAs are just fine. In most applications where I might consider using SVA Series or Studio L Series, I'd likely pick the SVAs.
That might require some explanation, so here goes.
I've had an SVA 2100, 1800, and Center 5.1 system set up in my music, game, and fitness room for years. It is hands down excellent in playing rock, jazz, dance, trance, club mix, game sound tracks, and movie soundtracks. It has better low end punch and better dynamics than the Studio Ls will supply. At the same time, the Studio Ls will play high frequencies better, and they will generally sound better with acoustic, classic, ensemble, and choral music, plus they do a good job with other musical genres, too, but IMO not as well as the SVAs do. I've had E Series and S Series and Studio L Series gear come through here, but it's all moved on while the SVAs stayed.
If I could only have one system out of the two, I'd look at my overall usage before deciding. If I wanted a system that could do every thing pretty well, the the Studio L Series would be my choice. If I wanted to really rock out, play games, have a disco in my house, and watch movies with big sound (and really didn't care about the rest) then it would be SVA all the way.
Now to complicate this a little more, I'm likely to get rid of my SVA set up soon as I've made a number of JBL acquisitions over the past year and the herd needs to be thinned. I have a ton of excess Performance Series gear, and I'll likely move some of that down there along with a pair of L250s modded with Performance Series drivers and networks, and the Performance Series stuff really does outperform the SVAs.