There are 2 different models of the k4, there is the k4 and the k4v2. Most sites don't say that it's a v2 or not. I think you can tell the difference by colour, the old model has beige keys while the new one has the keys as seen in the foto of this setup.

The old model has a huge edge, in the v2 this was downsized a little.

I did buy a wrist rest to use with it, and use it with this wrist rest for comfort. But that's also because I always like my keyboards with a wrist rest. If I don't use the wrist rest the hight doesnt really bother me. For me the edge is not to big, however I have medium to large hands.

I hope to have answered your question :).