i just made a compilation of all the rifle, smg and mg iron sights (20 in total):
http://img.photobucket.com/albums/v220/bifutake/gamezdin/ro2-rsironsights.jpg~originalhttp://img.photobucket.com/albums/v220/bifutake/gamezdin/ro2-rsironsights.jpg~original
i really dislike the sights on the garand and especially on the m1 carbine. that thing surrounding the actual sights, is it called a sight hood? yeah, i think they're too thick on these two weapons. they make me feel insecure about what's going on just to the sides of where i'm aiming.
the japanese mg, type 96 and the type 99, is just awful imho. visibility is bad, mag capacity is low, recoil is high. i just don't see any benefits in it, compared to the m1919.
regarding the bolt-actions, i feel most comfortable with the mosin, since it's the only weapon i've got at level 50 as of yet. my kar98 is at level 41. that being said, by comparing the two side-by-side, maybe the kar98 has a slight edge because of the position of its bolt receiver lock (i hope that's what it's called). see, it's pointing downwards, which gives you a bit more awareness of what's happening in front of you.
but they're all very deadly when in the hands of a person that knows how to use them. that one aspect plays, in my opinion, the most crucial role.
edit, backup link on steam:
http://cloud-2.steampowered.com/ugc/595890204007065468/0275535C9AFE84CE8F1E9C89C5758D5B359CC84D/http://cloud-2.steampowered.com/ugc/595890204007065468/0275535C9AFE84CE8F1E9C89C5758D5B359CC84D/