To get one for gaming only is overkill indeed but it can't get better than HD 800, K812, several Stax, TH-900 and T1 for gaming or let's say everybody will notice their technical superiority when comparing to good recommendations like the X1, K712 Pro. The only question is if it's worth the upgrade price.
Games like BF4 on PC sound and immerse very very good and are very much worth it (forget about CMSS-3D on HD800/K812/T1) , not so much for last gen over Mixamp or older PC titles that sound bad today (Bioshock, MTW2
). Samples get better by the day so in the end I'd choose one high end phone over a 2-3 mid tier collection any day.