I have said it time and time again that you can capture great images with anything. Case in point is this image below. It was captured with the Nikon D3100 and the Nikon 70-300 VR which is a F4.5-5.6.
You can see how sharp the actual image is when I zoom in on the eyeball. Take a look at the settings I used and see how you can translate that into your every day shooting. Listen to why I was at 800 ISO, why I set the VR on why my shutter speed was where it was.
Which image do you prefer, the color or the black and white?