It's one thing to be "happy with" current sensor capabilities...but I was somewhat dissatisfied with 5d2 shadows before the D800 was even announced. When the D800 was tested, the dissatisfaction with 5d2 shadows grew. When the 5d3 was tested and found to have similar or worse shadow noise in low ISOs to the 5d2, it was a disappointing announcement for me.
When I bought a 5d3 for myself after craving good outer focus points with Canon lenses, I experienced no surprise and only minimal disappointment with the shadow noise. However, I couldn't forget that the D800 was so much better. Whether Sony or Nikon is responsible, it's in a Nikon camera and I wish something comparable was in a Canon camera.
It matters to me.
That's why I started the thread. Not because someone here has a solution, but because it should be acknowledged for what it is: Canon's shadow noise is inferior to the D600/D800/D4 and needs to be improved with the next update.