Technicalities exist, and technicalities are what you should be looking for

FR graphs tell you the distribution of frequencies, ie. how loud each frequency is. Nothing more, nothing less. A frequency distribution you don't like can be fixed by EQ (though some devices degrade the audio quality after applying EQ), but you can't EQ your way into detail, timbre, imaging, speed, etc. Soundstage is the one thing where you can improve through EQing, but not by much. Material doesn't tell you any reliable information about the sound either.

The most important thing really, is to try the headphones yourself.

IMO, the utopia and 800s perform quite poorly (not just for the price), as with most headphones on the market. Two i really recommend trying are the Meze Empyrean and Susvara. Below that the Arya is decent for the price compared to other headphones, but is easily beat by IEMs at the same price.

Another thing to keep in mind for headphones is the DAC and amp, which makes a massive difference in sound. So much so that I wouldn't recommend buying anything unless you can try everything together at a shop