Thank you, Ulises
So, would you recommend T5P ?
I don't care if they are very large, OPPO PM 3 cans are a bit small for my ears
I don't really need a lot of bas, PM 3 it's okay, but if there is a bit less, no problem with that
What about the soundstage ? What was your previous headphones ?
Again, thanks a million, Ulises
LE : what do you mean by " the t5p isn't for everyone " ??
No problem

I've owned/own Msr7, HP50, M50x, Dt770, T5p, Phillips SHP9500 and I've listened to dt1770, shr1540.
SS: VERY large. Some of largest and most well defined SS out there.
I haven't heard the pm3 but people often put it in the same league (although with different sound signature) as Msr7. I don't know if that's true, but assuming it is then T5p is one level above the dt1770\shr1540 which are one level above the Msr7. In other words, should be a dramatic improvement.
The T5p require a lot of break in and they are somewhat bright and thin sounding. Although impedance is low and you could power them with a phone, not getting an amp would be a terrible waste. An amp, even a humble magni, improves these by a large margin.
These are much less forgiving of bad recordings than anything else I've owned, so beware. I'm planing on getting a lyr 2 to pair these next month to have a little more warmth
PS: these might be high maintenance in the long run (official pads are expensive). Think of this headphone as a Mercedes Benz class S and the Pm3 as a Toyota Camry.
PS2: these are the most refined and holographic closed headphones I've ever listened to (although people here have probably heard more headphones than me)