So we basically agree, only you fail to get what my reply replies to, at times.
Oh, and I did see your silly post in some other thread (forgot what thread it was, I did not bother to reply). Funny thing, this: I have a Nikon film SLR.
You can say I "basically" agree with you regarding this lens discussion.
But not about other things, such as 50D AF vs. D300 AF, ergonomics. Some arguments you posted are silly to say the least (like your 450D to beat the D300, and Canon ergonomics better than Nikon's

). You seemed to be fanatic.
You never asked me WHY I say the ergonomics are better. And yes, my 450D DOES AF in the dark very well (and fast) with an f2.8 or faster lens, it really does beat a D300 in low light AF. What can i do about that?
Anyway... about the ergonomics. The Canon menu structure is quite a bit better, ergonomically speaking. It is learned faster, it is grouped more or less more logically, and most of all, you do not have to scroll and search all the time.
Yes, when you are used to one, the other will seem daunting, no matter which way you look. but really, objectively seen, the Canon menus of the modern DSLR models are better, ergonomically.
Then there is the placement of the main controls. The Canon shutter button location is pretty optimal, a natural position of the index finger. The index finger naturally moves effortlessly towards the thumb, you feel a bit of strain the other way around (towards middle finger). The position of the front dial of the Canon bodies is quite ideal, in this respect. The Nikon front dial position makes for either a cramped position of the index finger, or worse, some say it is designed for the middle finger.
If you use your index finger, you will notice that from normal comfortable grip you actually have to shift your grip a bit to operate the front dial (try it).
The deep position of both wheels in Nikon bodies also makes operating them less than ergonomic.
Placement of ISO, AF-on/AE lock, AF point selection is all very easily reached on most Canon bodies.
The ONLY valid quibble I have read from Nikon-has-better-ergonomics proponents is the placement of the DOF button. And the lack of mirror lock up button (but at least every Canon DSLR has mirror lock up).
My arguments are always about things I read and personal experiences with cameras. I belong to a shooting club and I have the chance of playing with cameras of my colleagues - there are cameras from p&s to D700 to play with, unfortunately nobody has the top pro cameras.
I have a Nikon D50, a film Canon EOS 3000V and a Canon A75 p&s, my brother has a Pentax K10D and a Nikon D40. Therefore I'm not biased.
Misinformed then.
ergonomics |ˌərgəˈnämiks|
plural noun [treated as sing. ]
the study of people's efficiency in their working environment.
(it really is not about the hobby-horse of Nikon-has-better-ergonomics proponents about the size of the grip. And actually... in reality the grip from the "digital rebel" series is bigger than the Nikon D40/60/3000 grips, which are so short I have two fingers under the camera).