So I have the Mirage Carbon 1000 and ridden 20+ times in the last 2 months. Before that I had the v2 Mirage 1000 and 800. Unfortunately, I haven't ridden the new Mirage Carbon 800. I also have the new Gravity carbon 1200.
The new MC1000 is a great wing, design-wise it is quite different from the v2 but the underlying feels is similar but just polished in every way - smoother ride, you can push it harder through carves and pop a tip out and little or no cavitation. I felt that in the v2 range the 1000 was the better wing that the 800 but with the wings being redesigned for the v3 range and the MC1000 (v3) being such a refined product my assumption is the 800 will be equally good if you want something a little faster. Though the 1000 can be pushed to decent speeds and the lift evens off nicely as you get faster so it's controllable. I'm 105kg and ride the 1000 as my main wing but my coaching partner Danny also rides the 1000 and he is 73kg, so its pretty versatile.
The other thing worth mentioning is the construction - way lighter than the v2 and so much stiffer due to the integrated fuselage.
I'd love to try the 800 too, I think it will be a great wing. I believe Titouan uses it for Wingfoiling, so must be pretty good for it to work for him in that way.
Sorry I can't offer you the comparison to the 800 but my guess is that either will make you a happy foiler