My workhorse is my 24-105 f4.0 Canon L. It is a fantastic lens as a standard zoom. Of course you cannot beat primes and my number 1 lens which does not get as much use as it deserves is my Sigma 50mm f1.4. It creates a beautiful bokeh and is as solid as a rock. Beautiful images, bright and crisp as you can get. Far superior to the Canon L lens. I think my next lens investment will be either 85mm Sigma or 85mm Canon. I favour the Sigma at the moment.
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