Watching the 25th Anniv encore a nth time, I could say the original cast from 1985/6 can still more than hold their own, Wilkinson sounded better here than on the 10th (although it's one song, so maybe he doesn't have to reserve his vocal cords), and I was thinking they could have even reused Michael Ball for Marius, if they had wanted, since while age-inappropriate, this is concert not a play...
Personally, I like Lea's vocal peformance as Eponine (10th) more than as Fantine (25th), although as Fantine, she seems to have the best acting of the characters in the play (25th). Vocal-wise, her performance as Fantine is great, but they are so many great vocals (Alfie Boe, Karimloo, even-stoned faced Norm Lewis) that it would be hard to justify saying Lea's is the best vocalist on the 25th.
Of course, the worst vocalist is easy...
Nick Jonas is there to sell tickets (for the simulcat on movie theatres? Since the O2 will sell out with or without him) or DVD? It's not just his out-of-place vocals, he has no chemistry with Cosette, unlike in the 10th, where you can see what Marius and Cosette see in each other at first sight...
Magnavision: Are you reading this thread, this DVD's thread is the liveliest it has been in some time. Maybe it would be wise to released the 2-discs 10th Anniversary, it's BBC-Warner, so it's under your umbrella.
Personally, The 10th Anniv DVD I owned the flipper from VCi (fullscreen), so I am biased in urging Magnavision to release the 2-disc version from 2008.