i have the L 24 to 70 mm. great lens. in life, i believe you get what you pay for. want good optics, good pictures that you have the versatlity to blow up or project on a large 3m by 2m screen which i do, THEN BUY THE L LENS . no regrets. if you do only 4 R then dont bother but for big blow up and projections, the sharpness, clarity , contrast and colour makes the price worth while. what the heck you need to pay for quality. only problem is weight but i go travelling with 12 kg of good equipment [ with tripod] but extra weight is no problem if you want excellent results