Hmmm, last I knew iTunes downloads were 128kbps and a quick look into a couple of older 2007 articles, they state EMI products are now 256kbps but the others are 128kbps; so unless they have upgraded the other producers to 256, iTunes is a mix.

Jason
M80 v2
VP160 v3
QS8 v2
PB13 Ultra
Denon 3808
Samsung 85" Q70