Headphones are a bit of a complicated subject, since measurements may not be consistent across different sources (differences in technique and rig), different places use different target curves, and not everyone has the same preferences.
Personally, I am not a fan of Sony audio products.
Their speakers and headphones never sound “right” to me, even if they’re EQ’d to measure flat with tools like Sonarworks.
Sennheiser’s HD600-series is the opposite of that, where everything sounds natural.
There are no significant differences across the range - though the HD600 is considered to be the most neutral if you are going to be using them without EQ.
They don’t extend out to the very low sub-bass frequencies, but few open-back headphones can pull that off.
I find the HD600s quite comfortable now, but they did clamp tightly to my head out of the box.
You can stretch out the metal parts of the band a bit, or leave them stretched out over a box/stack of books/yoga block to lessen it, but that aspect of them has never been quite right - and even though they’re on the lighter side of monitoring headphones, there are days when I just can’t wear them if I have a mild headache.
Beyerdynamic headphones are quite varied across the range, and a lot of their models have piercing treble - so I’d definitely look for reviews of specific models, or try them out before buying one.
The new “Pro X” range seems well-regarded, at a reasonable price - though I do find that round headphones like those are less comfortable than oval ones (especially if your chair has a headrest).
I’ve never had good success with any modern AKG headphones.
Even if they sound good, I’ve found them to have fragile/unreliable build quality, using plastic in parts that take stress.
The K371 measure well for a closed-back headphone at a low price, but you lose the low-end if they aren’t fitted right or shift about on your head. I’ve heard many tales about them snapping too.
Same story with Austrian Audio’s products.
These are smoothed measurements though, which makes everything look better - and it doesn’t include things like distortion measurements.
So don’t take it as the last word on these headphones.
Planar headphones seem to perform better than dynamic headphones, especially at lower frequencies; but they tend to be more fragile.
Most are also very large and heavy, too.