Update from me...
I've been travelling for the last couple of months so I've been taking a lot of photos, but not working on any. When I got back last week, I tried out Adobe Lightroom CC 2015 (it's available at no charge as part of my work CC subscription).
The only thing I'm envious of, is the performance. On my 4K screen, LR is lightning quick compared to C1. Even when C1 is running properly. I say that because, sometimes when I start C1 (8.3.1 on 10.10.4) lately, it's unbelievably sluggish (more so than usual) and when I checked with Activity Monitor, I've noticed it using 125% CPU even when it's doing nothing at all (I just let the C1 app sit idle). A restart of the app will usually fix it.
I'm wondering if anyone else has noticed this?
I'm still blown away by the image quality, particularly the initial sharpness and lack of noise. C1 definitely has a significant advantage over LR here. In fact, I find it hard to replicate the initial image quality even making adjustments in LR... the sharpness settings in LR only exaggerate any noise. Whatever C1 is doing to provide sharp noise free images right out of the gate is impressive. I also like C1's Clarity and Structure controls much better than LR's equivalent. And I prefer the shadow and highlight adjustments in C1 as well, they just seem more refined, resulting in a better look.
So while I love C1, I really hope that Phase One invests in performance... that's one key area they lag behind the competition in my testing.