Thank you Steffen (aka @TheGardner) for you R4.1 HCL reports, which are online now:
* [ThinkPad P50](Hardware compatibility list (HCL) | Qubes OS)
* [Nitro-PC](Hardware compatibility list (HCL) | Qubes OS)
Your reports gave me plenty to think as they where nearly indistinguishable from your RC2 reports. I also recognized that there are currently 74 reports marked "R4.1" but (almost) none of them marked with the respective RC number. I will go through them and reconstruct the RC number by submission date.
Finally it got me thinking that we should require 'clean install' for the 'community-recommended list' due to the cryptsetup2 and other potential differences.
This was very helpful, Danke schoen! (Sorry for the switch to English, but this way the audience for the above remarks is bigger).