I just picked-up my second Sinn. I have been looking at the 857 UTC for years but always thought the dial was too busy and text too bold. I was able to finally see the watch in person during the DC WB roadshow. The Testaf version with the orange UTC really did it for me. It did not seem as busy as the regular 857 UTC and much smaller than I imagined. I have a 6.5" wrist and it seems to be just right at the maximum that I can wear. The dial is still busy but there is also an elegance to the watch that is hard to describe. It also looks much smaller than I remembered from the roadshow.
Will be testing it out in the cockpit soon.
Here are some pics and my total collection. I think I am done for sometime now.