I bought a new K812 and I want to share a comparison with my Beyer T90 which I have for a long time. The headphones are not warmed up, my ears are not used to the new AKG yet, so my opinion may change after a month. The test was compared on a DAC and a balanced amplifier in which you can simultaneously listen to 2 pairs. The review was done with the help of a translator, so please consider) Convenience is on an equal footing, the T90 is better, but the AKG has better ear cushions, the ears do not touch anything. I was surprised that the K812 plays 36 ohms quieter than the T90 250 ohms. I checked it on the phone, DAC and amplifier, the T90 is louder, so when I compared I changed the volume. The resolution is much higher with the K812, the music is more precise or peeled. More higher quality in one word. Stage - I thought the T90 had a wide stage. But in AKG it is 2 times more. The depth is the same, but everything sounds farther from the head and there are more micro-details. There is a lot of air on two headphones, the same. But the distance between the instruments is much greater on the 812s. The bass is the same, I listen to most of the ambient, tribial, house, indie. The middle and here the 812s are losing (after a couple of hours out of the box). They are distant and not involving, more recessed. I seem to be watching music and not listening. There is no emotion and no dancing. High everything is complicated here. Beyers are recognized as very bright headphones. And they are rather bright from my amplifier. But they play in a funny and musical way. High voiced but no sibilants. K812 is discreet and dry, I would say. Tonality - T90 is fun sounding, rhythmic, good for rock, but needs a good amp. But lower resolution and smaller scene. After AKG, the sound is more consistent, the sound class is lower, but not so much. К812 - very atmospheric, analytical sounding, neutral, emotionally less vital than Т90. Pink Floyd - Pulse - 2018 DSD won the Beyers in terms of drive and emotion. Jazz and Organ wins, of course, AKG, they are more melodic in individual instruments. I listened to Lisa Gerrard & David Kuckhermann - Hiraeth (2018) and gave my sister a comparison of both headphones, she said that AKG plays cleaner. This is a superb recording of vocals and ganks that play well on any system, but the more advanced headphones delivered even more accurate sound than the cheaper T90s. There is only one conclusion, the 812s are more technologically advanced, they bare the music making it very accurate but not as vital as we would like. I hope that after warming up a month later, I will perceive them differently. Thanks to whom this review was useful.