Use other default font

The default sans-serif font is kinda ugly and doesn't fit the font used in our logo. I couldn't find a corporate design page and I wasn't able to deduce the font used in the pdf/eps/svg. The MPG uses FSSilasSans on some of their websites (not free) and Roboto on others, out of which Roboto looks more like our logo. The scaling however differs from the current font. Using 83% and compacthead the title about fits the size of CSC within the circle,

\usepackage[scaled=0.83]{roboto}
\usepackage[scaled=0.83]{beramono} % just because

but for frames having a subtitle the space between title and subtitle appears to large to me. I am open for debate.

While being at it, I would also suggest to change the monospace font for beramono, which supports a.o. bold glyphs.

Update

Here is a comparison of Computer Modern, OpenSans, and Roboto (in that order):

DAMN_fonts.pdf