If you value ride comfort more than muscle-car impressions, you should keep in mind that ride quality in V-8 models, and those with larger wheel upgrades, is noticeably harsher than in V-6 models. R/T or SRT models can be a little jittery at times, while V-6 Chargers are more sophisticated and quiet.
HEMI cars also have a bit more engine noise entering the cabin--if you call the HEMI's throaty rumble noise, that is. Road and wind noise are well damped no matter what, and interior materials and trims are top-notch.
However, the flamboyant muscle-car look of the 2014 Dodge Charger doesn't impact interior space or usability all that much, although you do pay for that high beltline with outward visibility that's a little more limited than in other sedans.
Thanks to the rather blunt, upright styling, there's plenty of headroom all around. Front seats are wide and well bolstered, and wide doors make ingress and egress easy. Legroom especially is a little tight in back, but if they complain too much you can remind them that it does meet police-car standards.