Well, you have more experience than I did when I got started
I'm an HVAC and refrigeration technician, and while on a job I met a customer that let me listen to his HD800 and PS1000's and was immediately impressed with the PS1000. The HD800 were great for their extremely large soundstage, however, I didnt perceive them as being good for actually listening to music. Though, I will admit that I didnt get a good listening session (2 songs per headphone). The PS1000 though, while definitely not the top in any one category seems to hit all the buttons with me, not quite a wall of sound but close enough for that massive detail feel, strong bass that was not overpowering (unless the song calls for it), and really fun sound.
I saved up and got my own, and it's definitely my favorite headphone. I've only gotten to compare it to a few other headphones though, the closest I've heard for me was the he500, and if I hadnt been able to save up enough for the PS1000 than I definitely could've been happy with the he500, especially for the price difference. But I will say my PS1000 will probably outlast the he500 by about 40 years, will probably be passed down to my grandchildren
The akg k702 anniversaries sounded ok, just not in the same league. Great positioning and soundstage for the price, but the music just sounded off.
It doesnt seem like the PS1000 is much cared for here, though I could be wrong, but there are a tremendous amount of great headphones (some significantly cheaper) out now and I think in part due to the price tag of the PS1000, and the fact that it has a unique sound that is different than most others (even other Grado's), that its not much liked or used.
But like everyone says, its all about personal enjoyment, and for me the PS1000 is a masterpiece