Well, not as simple as the vintage being better.
Depends on system synergy. To be honest, I think the second post in this thread hit the nail on the head. I think the SemiSouth SiC SITs just aren't as ideal (tho, not bad either) when compared to the original VFETs.
I'm using an amp that's been modified from the SIT-3 circuit topology to adopt the big Tokin SITs. This thing is amazing, better than even my ultra-high-end, Japanese vintage amps in just about every regard.
But again, speaker matching is important.