Is anyone even considering VC when they are comparing with 4005.6+TC?
Just try shooting a small bird with 4005.6+TC and a lens with IS handheld and then let me know what is your keeper rate.
For those who are mentioning about lens from ebay<1000, do the ebay lens comes with VC, autofocus?
I had 600L in past and yes i loved the output but i start getting tired carrying so heavy setup and then going out less and less. So for me i don't want to send 12k and doing nothing, i rather spend 1k and take shoots once in a while and don't feel i have white elephant standing in my dry box.
Anyway it all depend on individuals, i love bird photography and this is more like a hobby. I don't crop 100%, so i can still live without peeping pixels at 100% crop (maybe i have to low standard in some people eyes).