Its funny how we all see things differently. Overall I liked the E60 and the 6 series but they are starting to date because of their bold styling and funny shapes. That said, spec'd nicely these cars look great. Msport E60 will always be a nice car.
However, I just think the new 5 series looks sharper, lighter, less "lazy". One thing I didnt like about the old 5 was the interior, but now it looks neat. The new 6 immediately looks better without the bangle rear (facelift does look acceptable though) and it overall looks more sleek. I think the new F10 reminds me of the old E39 and the new 6 is what I wanted it to always be from the start.
I like where BMW in going with these 2 models.