Image sharpness on 17-40 F/4 L lens

[ShutterbugJohan]

• The $100 Kit lens is slightly sharper
• The $150 IS kit lens is much sharper
  
• $350 Sigma 18-50 f/2.8 is sharper.
  
  
• $450 Tamron 17-50 f/2.8 eats the 17-40 for breakfast.
• $1000 Canon 17-55 f/2.8 beats it, no surprise.

Yes, even the lowly $100 kit lens is sharper than the 17-40.

On APS-C bodies, the 16-35/2.8L and the 17-40/4L shine when it comes to contrast and build quality. Also that they are compatible work with future upgrades to FF. :-)