Are you seriously comparing the version numbers of two completely different applications? That's like saying Apache is twice as good as Nginx because Apache is on version 2.4 and Nginx is only on 1.5.
They are not completely different, they were made for a
purpose(blogging), and the fact that Ghost was something
that appear recently which is why it base features are
things that the trend of today doesn't mean that suddenly a
well stable project like WP can't whole a candle to it.
Yeah, we all love new a shiny things, but that doesn't mean
that at the moment that they appear they will going to be better that well established tools like WP. As i wrote
before WP is at 3.8(pretty stable) and Ghost at 0.4(early
alpha) the numbers never lie. But don't get me wrong, i
would like Ghost to success but still needs more time.