The problem with the PSBs is that they stick out A LOT.
The AKGs have a closer profile to your head.
Also since the PSB is a portable closed-back, I'm guessing you're using it primarily for outdoors/fashion. The K545 is the smallest, most portable, and sounds really similar to the K551 - which is sonically the best AKG, but it's HUGE.
If sound quality is the top priority, the PSB just about beats the K551 overall, but if you don't mind the super-wide cans on the K551, that's a close 2nd.
So, I was thinking of the whole package, not just SQ.