That is the problem with relying on the views and opinions of everyone - people are so varied on any given aspect of how something sounds. Earlier, I read a post in the this thread in which the 535 owner stated the improvement over the 535's is huge. I am sure both of you are correct in your statements, the question is 'who would I most likely agree with - given my tastes?'.
But, it is what it is. Still, if the improvement over the 535's is only minimal, then is the added cost justified? I guess the answer to that question is based on the individual making the decision and how much that improvement, however small, is worth to him. But from a common sense stand point - the cost difference is significant so the expectation is that the degree of improvement over the 535s also be substantial.