With the exception of weight, I love my 200-400 f4 L IS w/1.4x TC. This is one of the most versatile lenses on the planet with incredible IQ that rivals the big white primes 200-400 and is d???? good even with the 1.4x TC engaged. You can also use it with a 2x extender (internal disengaged) for a high quality 400-800mm @ f8. I love the fact I can have a very high quality zoom range from 200mm - 560mm with the flip of a switch. As long as you are in a vehicle where you can use a support or bean bag, this is the perfect African Safari lens for versatility and IQ. I am a beefy guy and can handled the lens for a few shots, but not recommended. I suggest that you check out refurbs on the Canon site if you get serious about buying, I saved around $3k. A local lab inspected the lens and said everything was perfect. No AFMA required on my 1dx II. I would show it under the bus for a 4 - 5lb, 200-500 f5.6 L IS if it had great IQ because of weight and bulk. I am getting older and trying to shed some gear weight. I went from the 70-200 f2.8 L IS II to the 70-200 f4 L IS II to shed a little and looking at other options.