My overall impressions are mixed.
I did an in-depth analysis on Focal’s years ago, and have been watching the reviews and measurements ever since. My impression is that Focal deliberately makes their speakers either "hard to drive" or "scale with amplifier." Two terms that mean the same thing.
Both the B&W and the Focals also suffer from odd off-axis oddities which limits the sweet spot.
If you want the best out of any Focal speaker you should be prepared to get a sturdy amplifier. I’m not sure how the Anthem will fare honestly, it may be fine. I am with James though that you should consider Revel and Monitor Audio as excellent counter points that are easier to drive and will give you a wider listening window. They are also going to sound somewhat laid back at first.
Otherwise, I think that the B&W and Focals each have their quirks and I don't see switching these speakers as much more than a lateral move. IMHO, keep what you have for now and switch to something your ears tell you is a real positive improvement.