I have a z3 4-12x50 and a previous model VX3 4.5-14x50
The swaro is brighter and has better colors, at night I can almost see more thorough it than with my eye alone and the only reason I say almost is because I dont see how it could possibly be better than my eye, I feel I can see more. The vx3 while decent isnt in the same ball park but not bad.