The 6D will be able to more easily use other brand lenses with a simple adapter, if that matters.
It is also a bit smaller and lighter (but feels less well built than the D610 too)
D610 has better DR at low ISO.
6D has better noise smoothing at high ISO.
There isn't that big of a wrong choice between them.
Both have cheap f1.8, f2, f2.8 prime options to get things going.
Originally posted by 6BQ5 When I saw the OP's opening post I was also wondering why not mirrorless in the long run? I understand the EVF vs. OVF debate but EVFs will no doubt get better and better. Sony is going full throttle with new new lenses and bodies. Seem to be like a hip and happening system to get into.
Few problems with the Sony A7/r baby.
Lack of native FE lenses for the benefit of AF, wide open focusing, exif data, TTL flash
Sensor reflection issue (not a killer in some cases but better be aware of it before purchase)
Not as good AF in low non contrasty situations.
Potential light leak for mount
Potential light leak from adapter
Its the best MF platform out there now IMO, but I have reservations recommending it fully due to the issues it has., so the potential buyer need to be aware of them and decide if it will be an issue for them or not.