that too is a free upgrade!
i've touched mudbox once, but not for long or seriously
zbrush is a lot different to normal apps, different concepts on the menu bar at the top
but i get the feeling if you really get into it it'll be super fast
there's a hotkey combination for EVERYTHING
that's a "Ch" pronounced as a "K"
Computer skills I should have:
Objective C, C#, Java, MEL. Python, C++, XML, JavaScript, XSLT, HTML, SQL, CSS, FXScript, Clips, SOAR, ActionScript, OpenGL, DirectX
Maya, XSI, Photoshop, AfterEffects, Motion, Illustrator, Flash, Swift3D