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clearly there's a lot to consider. I own a Fuji 55-200mm lens (200mm equivalent to 300mm on FF) but can feel it lacks some reach in wildlife shooting. so a 100-400 mm plus a 1.4x extender is the clear choice. I'm debating on whether I should build on Canon system, or should I buy Fuji lens and sell Canon 5D for cash? I incline to buy a Canon 100-400 lens because if this will let me get some power of full frame.

my research also points me to this lens. I also like 300mm F2.8, but its high retail price and 5.2 lbs weight just do not fit.

Hi I'm selecting a lens for shooting wildlife. from my research the following lenses are on my list: (1) Fujinon XF100-400mm F4.5-5.6 R LM OIS WR with XF1.4X TC WR converter (2) Canon EF 70-200mm f/2.8L IS III USM with EF 2x Extender III Lens Teleconverter (3) Canon EF 100-400mm ƒ/4.5-5.6L IS II USM (4) Canon EF 200-400mm ƒ/4L IS USM Extender 1.4x (my current gears: Fuji X-T2 with 10-24, 16, 23, 35, 90, 55-200mm), Canon 5D Mark III with 50 F1.2L) I prefer to bring the Fuji XT2 out during a travel or for street shooting because its light weight and smaller size. My first dslr is a Canon 5d Mark III. Its lens (new) are pricey and just too bulky to take around. say, I can easily put 3-4 Fuji lens and XT2 into a Thinktank 6, but I definitely need a Large backpack to carry the Canon Full Frame gears. But I'm reluctant to sell my 5d for cash because its current market value is much lower than my expectation, and in the future I can buy some used Canon L lens for shooting, considering Canon lens community is large for deals. If I buy the Fujinon XF100-400, I just need to add it to my Fuji should bag and ready. Or should I build on my Canon 5d and invest in some Full Frame power? Is it a common practice to bring two camera bodies out in a travel? The advantage is to save the interchange time. But who would carry two cameras to climb a mountain trail? what would you do in my case? just sell the 5d because it's out of dated even though it used to be perfect? or buy a FF tele lens to make it a dedicated wildlife system for crisp pictures?