While Cryengine has been well known for its beautiful forest environments, the newest fan-made Unreal Engine 4 videos show that UE4 is capable of providing good competition to Cryengine and render some rather impressive graphics scenarios.
While these are just fan-made videos of what the Unreal Engine 4 is capable to do, the highly detailed forests and the graphics in general are definitely impressive.
All three videos are very impressive and hopefully we will see some games that look this good as well as some new hardware to power them.