In the end I could not make it to Aden, so I visited Henrys in Mississauga, a branch I had not been to before. I am not much of a Henrys fan, but occasionally prices are good. Anyway, they price matched.
Interestingly, the Henry's salesperson of course pushed me on the 4 year extended warranty. What was more interesting was that she said, roughly “ the IS on this lens is at the front, and if you happen to hit it, even lightly, the IS may stop working, so the extended warranty is essential for this lens”.
Hmmm. Pretty fragile for an 'L'.