I already have Klemperer's recording of Fidelio (the studio version) which is glorious. Bernstein's is also glorious but in different ways. His is full of energy and creativity, and the Leonora overture version 3 is carefully placed between the penultimate and final scenes so that it fades into the final scene in a very effectively. Wonderful singing throughout.
PS I have up-dated this to 5* as I made a mistake in the original review