No issues with sharpness, but I agree with dcclark with regards to the rather odd use of desaturation.
For me its too binary, parts either have colour on or colour off. If I was going for the effect of highlighting the colour in the water, I wouldnt have done it in this way.
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Sony Alpha 77 and 100 with a variety of lenses
Lightroom 4 /Photoshop CS5
My Flickr
500px
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