I had the chance to rent this lens with the 1.4x TC
for the Miramar Airshow back in October. I have one photo in the database with this combo. I only took about 20 total (Friday practice show and Saturday evening show. The day I planned on going to the airshow, Sunday, it rained)
I am going for the Canon 500mm F/4 L IS
after I get back from deployment later this year (w/ the Canon 1.4x TC
) and will pick up the Canon 2.0x TC
I dont think one can go wrong with any of the high end 'L' Telephotos Canon offers.