Low Light and the EF 28-200mm

I have being trying out my recently purchased second hand Canon EF 28-200mm f/3.5-5.6 USM in low light conditions but a somewhat controlled environment. The image below had tungsten side lighting but no flash. The image off the camera is rather soft as lens reviews predicted so the post capture sharpening seems to be a must. Overall I am fairly happy with the results for £150. I would appreciate some feedback since I may be seeing what I want to see:rolleyes:

http://rankamateur.smugmug.com/photo...9_XzURB-XL.jpg