I've got the Canon 100mm f2.8 L macro and it's fantastic. Not only for macro but for portraits as well. Most of the time I use MF for macro, although on my 5D3 the AF is fast enough for most things.
The lens can be got at
www.panamoz.com for a very good price
http://panamoz.com/index.php/lens/canon/canon-ef-100mm-f-2-8l-is-usm-lens.html although I got mine at
London Camera Exchange for over £700 last year. Panamoz also do the Sigma 50-500 OS for £886 with a 3 year warranty.
They are imports, but you have to decide if you want to save £'s by sending them back to Panamoz IF the worst happens. The 2 lenses at Jessops would cost £2070 and at Panamoz would cost £1482 including p&p and 3 year warranties on both saving you £588.
This is a Jpeg SOOC and heavily cropped with my 100 L and 550D, f5.6, 1/125sec and ISO 400, this is one of my early shots but it'll give you an idea. On the full sized photo the detail is much clearer too.
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