Where's the keys
and
yes, I know they have none
Well, they do sometimes talk of a business jet version.
Russian president refused their business jet, though - on grounds that it was not Russian enough, and chose Tu-334.
324 cm cabin width, 213 cm ceiling height. Compares well with DC-9 (314 cm width, 205 cm height) or F-100 (310 cm width, 200 cm height).
What you could have inside F-100:
http://www.fokkerservices.com/eCache/DEF/7/308.html
An example of a MD-80:
http://www.gainjet.com/media/gen_pdf/MD83Brchr.pdf
As you can see, 313 cm is enough to have a fully enclosed bedroom and a hallway past the bedroom. Something which is hard to squeeze into Bombardier Global Express or Gulfstream 650. And even with delays, Sukhoi Superjet can be expected to enter service before Gulfstream 650 or Cessna Citation Columbus.