Better than a CAT?

I own a CAT JL2. It is the best amp I have ever heard. I would like to know if someone who has owned a CAT, or is very familiar with their sound, has found an amp that they have found to be better in their opinion. I would like to hear from those that have auditioned other highly touted ampfliers and decided to stay with their CAT - the CAT withstood the challenge. I'm really only interested in comparisons to the CAT, not genralized comments like ,"amp xyz is the best amp I ever heard", "you should try amp xyz". I'm interested in comparative comments from those familiar with the CAT through ownership or frequent exposure to it. I personally find the amp tough to beat with its Krell-like bass and SET-like immediacy. Thank you.