I am on the verge of ordering my first "L" glass, a 70-200 F4. I am wondering if after I use this lens for awhile will I be able to go back to my Sigma 18-125mm and be happy? or will I be disgusted with the feel and performance of this 'cheaper' lens.
My friend is trying to tell me that once I feel the 70-200 and see it's performance I will be FORCED into getting more L glass because everything else will seem second rate.
Does he speak the truth?? 



