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Thank you both for your reply.   I already own a pair of UE 900s, which are very good but I cannot consider a pair ear-phone because I have to switch with the headset I use for work every 10 minutes so a headphone would be more practical. 

Hello everyone!   I'm looking for an headphone to use at work (open workspace) and I need your help. It must have a good noise isolation even when not playing music because work can be quite loud (call center).   I'm considering the ATH-M50x and the UE 6000 (even though the NC is useless)...