the Dainippon Screen 8060 Mark II is definitely in another league than any Heidelberg drum scanner, in terms of optical resolution, color transitions, noise-grain reduction.
The Heidelberg drum scanners are even surpassed by many other scanners, including ICG 380, Aztek Premier etc...
In the past 3 years of searching, I've NEVER come across a used 8060P MkII scanner on the used market. NOT ONE. I know they were not produced to the quantity level of Heidelberg, Howtek, or even Aztek units, but still... Maybe they're just 'too good' to scrap out, or they were sold to scrap guys rather than going for sale, publicly.
I have an Aztek DPL8000, and it works very well. Pretty much the same as a Premier, optically/PMT wise. I've not had any scans made on a Screen, but from what I've seen of your work, the Screen seems like a very capable scanner.
However, there is ONE BIG THING: the Screen is HUGE. My DPL8000 is 2'x3' approximately, and two guys can easily put it into the back of a volvo station wagon for transport. I don't believe that is possible with the 8060SP mkII? I know, I know, these machines don't get moved very often(or ever!), but the sheer size of the physical machine is a huge difference. Folks like myself, who don't have loads of space, but still want to produce their own scans, like these smaller machines that can fit on a desk(a solid one!), or tucked into an office closet sitting atop a coffee table, etc... The Screen is big.
I'm only shooting 5x7 and smaller formats now. I had an 11x14 camera last year, but have unfortunately sold it. I'd have loved to shoot it for a portrait project I'd like to start in the next year, but looking at the benefits for the print sizes I'll be making(20x24 approx and smaller), I could easily get the quality level I need out of a 4x5 even. For someone like yourself, who scans for ULF and LF shooters(I've seen some of those pictures of 12x20" color negatives
), I can understand your needing a machine that can handle film that large.
However, if time, money and SPACE were allowing, I'd love to get one of these Screen units like you have, simply due to the sheer mounting potential over the smaller drums that my Aztek scanner uses(8x10 is a tight squeeze!)...
-Dan