Funny you should mention it, because I actually thought of these yesterday when trying to figure out which headphones they reminded me of. I have had Beoplay H6 (1gen briefly - they were too bass-empty), H6 2gen, H7, H8, H8i, H9 and H9i (not all at the same time) and they remind me a bit of the 2gen H6. I don't have them anymore, I'd say the sound is simular as I recall them, and right now they are (in Denmark at least) sometimes very cheap - under 200$. The retail price in Denmark for the 1am2 are around 330$ which is what the H6 are when not on sale.
The earpads are not as deep / thick - and they sit tighter around the ears, but as I recall the 1A they were thicker and deeper so I'm not sure that is what causes the heat. I'd imagine a person with big ears might have trouble fitting them.
I love the 1am2 for being so light - and if I look away from the sweat when wearing them while moving, I think I'll keep these as a suplement for my 1ZR which are used at home exclusive. I don't find much use for my Z7 anymore, cause they are more a home headphone as well. Sound-wise I cannot comment already.