Will the EF 800mm f/5.6L Soon Become Obsolete?

This image was made near Homer, AK with the Canon EF 800mm f/5.6L IS lens with the 1.4X III TC and the EOS-1D Mark IV. ISO 400. Evaluative metering +1 stop: 1/320 sec. at f/8 in Manual mode. The key to a successful composition here was placing the bird high enough in the frame [...]