Which 4K Display for my 15" rMBP 2014 (24-28")

Hello,

I am looking to buy a 4K Monitor for my 2014" rMBP 15" (specced out), i'd like the monitor to match the Retina display crispness and colour, quality as close as possible. I am a photographer and film editor, so I use a range of Adobes CC products to edit with, so the best colour, and crispness is vital!

I don't mind if the screen is between 24-28 inch, my budget is between $500 and $1000.

Current models I'm looking at:

Philips 288P6LJEB

Dell P2815Q

Please let me know what the best monitor for my money in 4K I can get for my rMBP!

Thanks,
Jacob