Row L is where the stadium seating/rake begins in the Richard Rodgers so I do think it's better than K because you get that little bit of height. No one can sit in front of you and block your view. I've seen the show from many spots and row M was one of the best, so I know row L will be fantastic.
We sat in the center of row O and felt the entire cast was performing the show directly to us. There were no heads blocking the view to the stage. It's as if we were perched on a throne getting a private performance.