Update.
I took it back but sadly they didn't have any others to replace it with. I was tempted to get a refund but instead, I opted for the Dell S2716DG and got refunded for the difference. It's brilliant. No bleed, no missing pixels and it's the latest revision. Very happy.
Moving from a 1080p cheap 60Hz screen to this is ridiculous. I do need to calibrate it though. Any tips? places I could go?