It will be interesting to compare them. I am very impressed with the Curio's and take them everywhere. As for tactile feel and ergonomics they suit me perfectly and the UV's will have to be exceptional.I think you will be a bit disappointed after the Curios.
Optically I rate the curios higher.....better fov, brighter, just a better view!
The Ultras, which I have, are superb, and only lag behind on a direct swapping viewing session.
However, those Ultravids are just superbly put together, and have a feel to them that Swaro and Zeiss just don't seem to be able to match.
As for the differences twixt marques, I know where you are coming from but I have always thought Leica's to be a little old fashioned and tired. But then I remind myself that I used to own a Lada Niva so my judgement is open to question!
(Great little car mind, never ever let me down and as rough as a badgers posterior..... but went everywhere and left LR Defenders struggling...when they were not in the workshop that is).