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Check with Wacom. Pressure work with Wacom Intuos Tablets with CC 2014.2.0 on windows systems I can report. I have seen problems reported about drivers and cintiq displays. Seems there is brush lag with the newest drivers that older drivers work better.
Check with Wacom for driver updates.
Also, what OS version are you using?
I use windows 8.1 and it seems that problem is really in wacom drivers.
After instaling older wacom drivers brush pressure works fine but i get this brush lag mentioned before.
Try an even older driver search brush lag cintiq Re: How to fix brush lag in Photoshop CC with a Cintiq 13 HD (on apple's Mavericks OS)?
They installed Cintiq 13HD driver 6.5.3-5 , from March of 2013
Try drivers from that time period