"If you want the best possible lens at this focal length then this is the best money can buy. I think from a value perspective this lens with the various tele-converters give you the most coverage and value for the money. I do also shoot a 70-200mm f/2.8 with and without the tele-converters with very good results, however the sharpness with this lens as expected is beyond comparison." bhphotovideo.com