[radiomann]

I have Dt990 pro 250 for awhile but keep reading about all these new phones out if there are any that are clearly superior to what I have

 

[dabtpa]

All I can say is I have the AKG 702s that are suppost to be better but aren't. I really think you have to go way up in price to get better sound. Start with the Sennheiser 650s and go from there. Usually when folks really like a headphone brand, they can go up that brand's line  and find something they like better. Try the Beyer T7s or T90s. If bass is your thing, the Custom One Pros offer a slideing switch that controls a port that allows you to change the sound signature on the low end.  You also might consider the Denon 6000 or 7000

 

[pp312]

Clearly superior in what way? Without knowing the nature of your dissatisfaction, if you are dissatisfied, it's impossible to advise.

 

[iKhaos]

I'd suggest auditioning several different headphones, learning a little more about what you like and dislike.
There are definitely technically better headphones, but it's more about what sounds good to you.

 

[Gagarin]

Some that are better:
 
Audeze LCD-2r2
Sennheiser HD600 (in my opinion)
JH13Pro
Westone 4R
 
Just to name a few of my favourites.

 

[AdamTR]

For the same price I think DT-150 is better..