Vasily is the other K, and he might be marginally better than Wladimir, but that’s faint praise. I think their main claim to fame is that they are huge, in great shape and both have doctorates. Of course, if Vasily were so good, he’d still be getting fights, but it’s been a while.
Other Klitchko brother is Vitali. He retired from boxing about a year ago and was elected a Mayor of Kyiv.