My 7D replaced a 1D MKIIn, an 8MP camera, (cost well over £2000 when new), - the 7D was a revelation yet the 1D was very much a professional camera at the top of the pecking order when I first got it.
And all this talk of high ISO and noise! When I used film, (not SO long ago - all my travel and wildlife images are still with Latitude stock library), I shot on Fuji Velvia, 50 ISO, rated at 40 ISO, or Provia, rated at 80. Latitude's current submission requirements state "ensure ISO does not exceed 200 unless absolutely necessary." So I shoot at 100, sometimes 200, and infrequently, if necessary, at 400 ISO. How easy photographers have it these days with the availability and functional use of high ISO's, - yet expectations are SO high, - I wonder how they'd cope if they suddenly found themselves with Velvia loaded in their film camera? I reckon we'd see a load of blurry images!