Some pictures of the Four Seasons George V pool/spa area:
So over the last 2 years I've now stayed in: Le Bristol, La Reserve, Peninsula (x 3), Crillon, Ritz, Four Seasons George V and Plaza Athénée. As I've said many times before, Paris is the most competitive city market in the world. The standard of hotels is so high that you could pick any number and be satisfied, whereas in London they may have a larger number of choices (unsurprising, as it is a significantly larger city), but the quality is nowhere close. The base price of rooms is agonisingly high, but once you get to suites then it's often better value than London.
For me my top 3 are FSGV, Crillon and Peninsula (as long as you're in one of the higher suite categories). La Reserve is a solid 4th choice if all else fails. Le Bristol and Plaza Athénée are good hotels, I just don't find them good enough within Paris to be considered great.