http://www.pbase.com/tnt_imaging/image/38723468/original http://www.pbase.com/tnt_imaging/image/35426247/original Taken from Fred Miranda's review site: http://www.fredmiranda.com/reviews/showproduct.php?product=19&sort=7&cat=27&page=2 This guy uses that lens, and you can check out his DA page.
This wasn't an L lens but it was 100-400mm so It should give you a good idea of the 'reach' of the lens.
Out of interest Xmetal, were you using a polarizing filter for those shots? They don't seem to suffer from any glare or reflection from the windscreens.