if you like the m50x, dont buy it... get the dt770pro instead. they are all around superior and typically in the same price bracket (in usa at least and cheaper than the m50x in uk). similar closed noise isolating design but better sound quality and a bit more soundstage.
if you wanted "soundstage" for gaming i'd look into the dt990pro-250 though for that you will want an amplifier. they are open cans with decent bass despite being open. somewhat bright treble, but you can tone that down with a good amp or EQ.
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i personally own an m50 (previous gen to m50x) and i love them, but they arent worth the crazy price for the m50x (though $100-120 for the m50 original isnt a bad price for them). all in all i'm satisfied but the dt's are better cans all around.