As a long-time Capture One user, and a big fan of v.7 (definitely my current go-to converter) I'm really rather disappointed with v.8.
Despite all the promised improvements - especially in the three most important things that matter to me:
* I'm seeing literally no IQ improvement from the new Raw processing engine, even right at the pixel level;
* the NR is possibly not as good - high ISO conversions in v.7 seem to hold their edges better than the same files converted in 8; and
* the highlight recovery improvement is marginal at best.
It's probably a bit snappier, but 7 was fast enough on my machine already; and any cataloguing improvements are lost on me because I use sessions.
And it crashed three times on me in about an hour last time I used it, a couple of nights back - more times than 7 has crashed on me this year.
The new UI is nice, though...
In itself it's still an excellent converter, and if I was new to Capture One I'd be thrilled; but to my eyes it's just version 7 in a pretty frock.
I'll probably upgrade eventually (I'll have to when I get a 7D Mk II) but for now, thanks but no thanks - another "improved" piece of software that fails to live up to its hype.