Am looking at getting a decent telephoto lens for general use for my 5D, at the moment i dont have anything over 50mm so am needing something with some reach, when the season kicks of again am wanting to get some shots of my brother in laws cricket team and my mates rugby team in action, and am wanting to use it for wildlife at Zoos, birds in the garden and the Farne islands Puffins
like i said general use.
in my price range at the moment is the Canon 70-200mm F4 IS which gets great reviews and stunning shots, while the 2.8 IS would be nice i cant justify the price or the weight, my concern with the lens is if the reach is not enough on a full frame lens or if there are other options like the Canon EF 100-400mm f/4.5-5.6 L IS USM for £920 secondhand or something else
help and advice would be great here guys

in my price range at the moment is the Canon 70-200mm F4 IS which gets great reviews and stunning shots, while the 2.8 IS would be nice i cant justify the price or the weight, my concern with the lens is if the reach is not enough on a full frame lens or if there are other options like the Canon EF 100-400mm f/4.5-5.6 L IS USM for £920 secondhand or something else

help and advice would be great here guys