From a purely footballing point of view, Sterling will never be as good as Sanchez as long as he has a hole in his arse. That may seem harsh but its also a reality.
This alone does not mean its a good deal for us. From a financial point of view it seems crazy to offer this for a guy who is out of contract and available on a free next summer. Also in the current transfer market, I think Sterling is now worth at least what we paid for him, 12 months ago I think this deal would have looked a lot sweeter. Additionally Sanchez is also 29 years old so obviously has far less time still in the game than Sterling.
Many on here wont entertain this deal at all but I can see pros and cons to it.