According to DxOMark, which scientifically tests digital camera sensors (which doesn't necessarily translate to actual image quality, because art is not science), the Nikon D800 is the best digital camera ever made. It even surpasses all digital medium format cameras!
That's pretty impressive for a camera with an MSRP of only $3,000 (body only). There is now no reason to spend any more than that on a digital camera, since none can match the D800.
In fact, the D800 will likely kill off all digital medium format, unless there are significant improvements and price reductions in that class. It will be tough to sell a $20,000 or even $10,000 camera when one could buy the D800 instead.
Also impressive are the Fuji X-Pro1, Sony NEX-7 and Samsung NX200, all of which produce full-frame results on an APS-C sized sensor. The X-Pro1 (without a lens) and NEX-7 (with a lens) will run you around $1,700, while the NX200 (with a lens) has an MSRP of $900 (I found it on sale for $750).
With the D800 as the obvious exception, the X-Pro1, NEX-7 and NX200 make full-frame practically unnecessary. These cameras might also spell the end of DSLRs with APS-C sized sensors, since they outperform all of them.
It will be interesting to see how camera manufacturers react to all of this.