The DP7 OLED is very nice. I've noticed much better colour, contrast, and overall neutrality than the AC7 OLED, which also uses the same panel, but driven by different (and cheaper) electronics. Lovely features for both ACs and DPs (great peaking, LUT importing, colour spaces, of course great blacks) and they seem to be calibrated well at the factory. I'm not a DIT but to my eyes, with perhaps a wee reduction in the red, the image looks very good. Everyone that looks at the image on set will want to see your monitor instead of any of the other ones. They do burn in, so things like status info overlays and frame guides can be an issue, but I try to mitigate that by putting a custom 50% opacity mask in the Custom Guides menu around the periphery of the image. Also makes all that status info a bit less distracting while keeping them visible.
The TV Logic VFM-058W is a nice upgrade from the 056 indeed. I just bought one last week. The resolution increase is very nice, and puts it in 'Retina' territory - can't see individual pixels. A bit brighter than the older 056 as well, and better contrast. Runs a bit hot; I can see why they put a heatsink on the back. Still has the same power draw as the older 056 though.