As I photograph many different subjects and in various ranges of the spectrum, I need and use many different cameras.
The Nikon Df is my main workhorse these last years, but for visible work I also employ D3X, D3S, D800, and there is the D500 on order hopefully allocated for delivery in the first batch in April. Much of the mundane product shot-for-web in studio is with a old and still fully functional D2H. For the unpredictable weather, 1 Nikon AW, for leisure 1 Nikon V1 or even a AW100 Coolpix. In UV, Panasonic GH-2 (mainly for UV video), Nikon D3200, D600, and Fuji S3 Pro; for IR, Fuji S3 Pro, Nikon D5300, D40x, D200, and the Panasonics.
I try to convince myself to like and accept a Sony A7 in order to deploy my dear old S-mount Nikkors but so far not with much success. The A7 also takes on some of the exotic lenses in my arsenal together with a NEX-3, Panasonic GF-1, GH-2, and some specially modified Panasonics and Nikon V1 (these with altered mount to M42 so I can put the strangest optical contraptions on them).
I guess the above indicates I have a very wide view of what constitutes a "good" [digital] camera for me. In the film days, the combination of Nikon F or F2 [Titan] plus a Nikon S3/SP was my preferred choice, unless I did large-format work with Arca F-Line view cameras. Also have Hasselblad Xpan, Bessa R2C, and if I search the premises, probably an ancient Leica or Contax.