I have to say, with this latest generation of SS, it certainly seems a number of super-tube-fans have moved across and not just for something different (Gian60 is a great example having it appears spent the vast majority of his time with ultra-rare, high end tubes).
Dartzeel's references, Audionet Scientist series, CH 1.1 and 10 series (and I would say this) Robert Koda have made big converts of people who moved to them from tubes (Mike Lavigne, Gian60, MadFloyd, JackD201, LL21 and no doubt more)...speaking for myself, we had tubes in the amplification for 21 consecutive years until only a few months ago...CJ preamps for that entire period of time. And as much as the CJ GAT 2 is a stellar work of art, I am even happier with the Robert Koda K15EX (and substantially more so).