Pros/Cons of Sony PXW-X70 vs Sony PMW-EX1R? (or Sony NEX-EA50 or Sony FS100?)

[IronFilm]

I'm a DSLR/MILC guy, thus asking this for a friend as I'm far from an expert on camcorders, but what would be the pro/cons list of a Sony PXW-X70 vs a Sony PMW-EX1R?

http://www.bhphotovideo.com/c/product/1072752-REG/sony_pxw_x70_professional_xdcam_compact.html
http://www.bhphotovideo.com/c/product/758895-REG/Sony_PMW_EX1R_2_PMW_EX1R_XDCAM_EX_Full.html

To also throw in a third one for comparison with these two, the Sony NEX-EA50 or even the Sony FS100 as a fourth consideration to be included (if only either one had built in ND filters, then I reckon this would be the strongest choice here perhaps?)
http://www.bhphotovideo.com/c/product/1076767-REG/sony_nex_ea50m_nxcam_camcorder.html
http://www.bhphotovideo.com/c/product/761580-REG/Sony_NEX_FS100UK_NEX_FS100U_Super_35mm_Sensor.html
(included the links so it is easy and handy for people to also see the specs at a glance)