I've had the 530 for couple of years, but not tried the 535, and I stand by my comments on the SM3 vs them. Seems to be a very mixed view on here in terms of how people hear the SM3 (some say too veiled etc). Personally, I think they outshine the 530 pretty much all over the place apart from perhaps with some vocals where I thought the 530 were excellent.
From what I can gather, the 535 are a noticeable improvement on the 530, but sadly I'm not in a position to comment.
I'm quite sure the sm3 are extremely mid-low focused and definitely not more neutral than the 535s.
Of course you're in a position to comment.
Don't doubt yourself.
If you want to stand by your opinions, let no man claim otherwise.