[tamir124]

Saw someone recommending ath m50, he recommended the ath m50S, in addition to that they got separated into 2 here
with this (ath m50 S  got more and better reviews ) http://www.head-fi.org/products/audio-technica-ath-m50s
 
Than the normal ath m50 http://www.head-fi.org/products/audio-technica-ath-m50-studio-monitor-headphones

 

[NA Blur]

Sonically they should be the same inasmuch as any two headphones of same driver build can be.