This year a Canon DSLR Pro Body entered my camera equipment line up.
That was the Canon 1D Mark III (circa 2007).
I also continued with the Prosumer DSLR Canon 20D. (circa 2005)
New "glass" to join my photo equipment included
Canon EF 300mm f/2.8L IS USM
Canon EF 24-105mm f/4L IS USM
Plus the Canon 2X EF Extender II Teleconverter .
Below images are a combination of both cameras. Can you tell which is which?