kin2son wrote in post #16035438
You get what you pay for, simple as that.
So if the 70-300 non L is 110$ more expensive than the Tamron it's automaticvally better? HMMMM Wait.... ohhhh... errrr..... no that does not seem to be true at all, indeed the cheaper lens is much better overall.
Seems your sweeping statement here does not work. 
Same example for Ed, as big time Canon lover, what's your take on the 70-300 non L, is that what you should get for the money or do you agree that your dig at Tamron is actually backfiring here? 
Ok kidding aside, the 70-300L is better, but it's absolutely nonsensical to make a statement as "you get what you pay for" as this simply does not hold up at all. The Sigma's F2.8 EX DC OS HSM is absolutely an example of where you can indeed pay less for a better alternative. The 70-300 VC is another example that is just much better than the 70-300 non L (The digital picture has really odd results here which do not jive with photozone etc.).