Very nice impressions. You are spot on to what I actually felt when compared with Momentum & UE. I have not tried any AKG yet, so I really cant talk about that. Although the AKG can be found in Best Buy, from auditioning there, I didnt like how they look & sound.
The MDR 1R is a great set when paired with the Z walkman without any amp. The pouch is cool. And since ppl relate the Momentums to Bentley, I like to relate the R1 to the Lamborghini 'Sleek & Sexy'