I liked my ZD given what it was; a two-generation old 22MP back. In that, it had noise issues over ISO 200, smallish and dimish LCD -- but readable in outdoor light, a buffer you could hit if firing rapidly for more than 8 or 10 shots and the occasional quirky DB error when shooting. All that said, it produced outstanding files when used appropriately. I had no color cast issues, no odd artifacting, no issues with long exposures and no issues heat or cold. IMO it is probably the entry-level bargain to MF digital...
Cheers,