I just completely disagree. Going from a retina MacBook Pro to an iMac, you can feel that the DPI is lower.
I would way the **** rather have a hi-DPI 27 inch than a 4k 32-inch without pixel doubling. Or any other combo. 32 inches is too big for my taste anyway.
Actually, I would rather lose a bit of space and gain clarity than vice versa.
I am with you 100%. I'm not a video editor, but just a developer across windows, mac, etc. Coming from rMBP my 27's look awful. With my rMBP I can change "resolutions", which helps a lot. It's sort of like an advanced CRT.
But the extra usable space that the monitor will bring will be huge and well worth the money.
I think ideally, I'd love a dual retina 24s (like the Dell).