This was a quick scene I threw together in 3ds Max using Forest Pack, a foliage plugin for Max, in order to decide on the renderer I wanted to use going forward.

Maxwell Render is pretty good except for the fact you have to go through the process of reassigning materials to everything you send to it, which I don't really feel is worth it. That's why the bushes are neon green. Mental Ray right out of the box looked pretty good, but it seems like if you work at it, it could be better. V-Ray 2 right out of the box just didn't look good. But V-Ray 2 using SolidRocks totally converted me to V-Ray. (I haven't yet been able to try V-Ray 3, which is supposedly easier to use. So I'll have to try it out sometime.)