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The 3 lenses above offer unique characteristics not matched by the major camera manufacturers:

• The 50mm F1.4 is optimized for wide open aperture photography with beautiful bokeh.  There are numerous other 50mm lenses on the market but they provide maximum sharpness when closed down several stops.  These lenses, in general, are not know for their bokeh.  The Sigma's excel on a cropped digital sensor.   

• The 50-150 F2.8 is designed for a cropped sensor and replicates a 70-200 F2.8 on a full sensor camera except that the sigma is smaller and lighter. 

• Why use an expensive 300mm F2.8 lens for sports when you can use an expensive 120-300 F2.8.  I can't imagine the number of football shots I would have missed if I could not have zoomed back from 300mm towards 120mm.

I would like to point out that these Sigma lenses are the high end EX lenses that utilize low dispersion, ultra low dispersion, aspheric glass elements, and exotic multi coatings to achieve their high end capabilities.  These lenses are heavy, built solid, and optimized to be shot wide open.  None of these lenses is necessary if you are not interested in shooting wide open and creamy bokeh is not an important factor.