People exaggerate way too much. I found the T1 to not even scale that much, more of a signature change. Expectation bias seems to affect so many people on this forum it's hard to actually see what the facts are. I remember when I first heard the Sennheiser ORP. People where saying how incredible they are because of the 30,000 and higher price tag! They were good but didn't sound better than the 1-2k phones I've heard previously.
The whole scaling thing is another myth. In my experience, if people have a headphone long term and by a different amp; they will say it scales regardless if it really does or not! Expectation bias is a tricky thing.
People expect the T1 to sound great because it's an expensive headphone. They hear this slight extra detail whether it's artificial or not and thing woww the details is amazingg, much better than my HD650 or whatever.
I think the HD650 is the most natural sounding headphone when it comes to the human voice. It also has one of the more engaging and beautiful tones in any headphone. It isn't a detail monster but it shows you what you need to hear, it doesn't go out of it's way to trick you into thinking you are hearing something unnatural.
The X2 is close to that but has a slightly unrefined treble. The T1 and HD800 all sound so dry and false. No matter what amp, they are both not even difficult to drive and I've had them on amps costing double the headphone and they still sound similar. Amps only help so much.