I'm about 45,000 clicks into my DeeAteHundred, I find it to be absolutely spectacular even up to 6,400, easily on par with scanned 6x6 color film when printed up to 40" wide. That said, except for the NYT assignment I did with it on Friday, it has sat idle since the first week of August and will until around Thanksgiving....:-)
According to my calculations, that's about right for heavily used camera. It's something like a click a minute, eight hours a day, seven days a week, for three months. What do you photograph? Fashion?