Yes. SilverEfexPro2 would just provide more choice of grain pattern.
Or Alien Skin Exposure 5,
which works as both plug-in and stand alone mode. Excellent, not to say the 'best' , for fine tuned grain and much more. First heard of this through David Adamson (Adamson Editions) in Sean Reid's initial review of the Leica M8 in Nov-2008 - haven't been without it since.