[rebel7]

Will the M-50s be a step up from the ones I have now which are Audio Technica ATH-PRO5 MS? Here as link the only thing that seems to be different between the two is the driver on the M-50 is bigger, 45mm compared to 40mm, and the the impedance is lower by 2ohms, and the DB is lower by 4. Will there be a durastic difference?
 
PRO5 MS
 
http://www.audio-technica.com/cms/headphones/f8a1723fb8e920ef/index.html/
 
M-50
 
http://www.bhphotovideo.com/c/product/477843-REG/Audio_Technica_ATH_M50_ATH_M50_Professional_Closed_Back_Studio.html#specifications