Updates about Tk

[Fabiano]

Hi,
I'm going to start my little journey into the Python's lands.
I have already red the old posts about but I suppose this is an evolving
topic.
I have understood Tk is the default Python's GUI toolkit, I have also
read that version 8.5 has native widgets and visual improvements.
My question is:
Are the new Tk comaprable with other toolkits(Qt, GTK,Wx?)?
Does Tk lack other features compared to the Qt,GTK,Wx...?
(Or: is there things you can't simply do with Tk?)

Thanks in advance for replying