Nothing like duck in the taste department IMO. Not as bland as chicken or turkey either. Pigeon may be the closest taste I can think of. Quail has a richness to it but because there is so little of it, it isn't a big part of the dish more that it gives a depth of flavour to the meat. A bit like the drumstick of a chicken has a different flavour to the breast, well a quail is all drumstick flavour in a way - that sort of depth of taste. It is still quite a mild flavoured bird though. Never had a tough quail either although I am sure it is possible.
Below is a link to several quail dishes (plus a lot of quail egg recipes too).
Search - Recipes - Taste.com.au