Kismetkibaat

I have just purchased a RX450H and it drives great; I have been reading on the internet that the RX450H is not too great in snow and can be embarrassing. My previous car which I part exchanged for the Lexus was a Range Rover Sport which cut through snow like a knife through butter; it also had hill descent control which meant you could drive down any steep hill in snow without any fear of collision; can yo someone let me know if the RX450H is really that bad in snow and whether snow tyres might make a difference in that case. My Range cut through snow even with normal summer tyres.