I've got some whites. I can take a picture of the stem/innards with a terrible phone camera if people want to compare with pictures of other switches, 2 secs.
OK. Potato pics incoming.
So as those who know me will know, I hate linear switches. MX Whites are a really linear switch. This is a side shot of the slider showing how un-defined the bump is.

As you can kind of see, the bump on the black part of the slider is really small.

And if you change the angle just a little, you almost can't see it at all. You can however see that the legs are slightly lubed. These are stock switches from mk.com and haven't been modded by me in any way.