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It has a deep natural contrast.
Built like a tank.
Heavy. Can be used as a hammer.
Trombone style so it does collect dust, although you need a lot of dust to affect quality.
No one wants to repair or service this lens, so if you get one, you are on your own. However, having just serviced the top mechanism on mine, it's fairly easy to remove dust and improve the zoom action.
Wonderful lens to use, but make sure you have a pack of painkillers as it's heavy and really starts weighing on you after a bit. However, once you've had a work out from this lens, you'll have the grip of a gorilla.
Optically seems best and happiest at f7.1 and f8. Under that, my copy at least handheld starts to get a bit rough (and it's not shutter speed being too low either). However, at f7.1+ it's bang on focus nearly every time.
AF is pretty quick, although not as quick as the modern stuff, but still keeps up with speeding cars/motorbikes for my work. AF speed really increased when using a 7D body over a 50D.