I've got a Canon 70-200 L Image Stabalised Lens in perfect condition.
Cherry picked from Jessops out of four lenses this one was the best.
They retail for £1350.00 & I'm lead to beleive they hold thier value well being Canon pro glass. Only used it a couple of times want to see if it's worth selling or weather to keep hold of it.
So what do you think it's worth ?
If it's boxed and still has it's carry bag and box and some Canon warranty left, then I'd guess at about £ 900 - £950 ? I haven't seen many private sales for the L zooms in the UK lately, so it's hard to say.
Without a warranty, I'd knock £100 off tho as the cheapest Canon service/calibration you can get (if you need it) is gonna be £ 60 +.
I'm not really into zooms though, so wait for some other opinions as I may be well off.
HTH,
S.