I don't know about Sony WX7, but with Sony NEX and SLT cameras, there are a few options. Use a CPL to get glare off and if light is limited, use one of the built-in stacking modes (Multi-Frame NR or Hand-Held Twilight). These modes are excellent for shooting in places with limited light and when flash/tripod are impractical or not allowed. Here's an image taken using HHT with Sony NEX-3 inside a rather dimly lit museum, of a display behind glass, where use of flash would have returned quite a bit of light show reflected off the glass:
Now only if Sony also incorporated its virtually silent shutter mode as available in my good old F828 (although, I think Sony RX1 has it, along with these features).