The article did say "tri-sensor" cameras, so we are talking 3 monochrome sensors behind a dichroic prism (with electronic registration to eliminate CA) so the resolution is not that hard to believe. Shallow depth of field is NOT desirable for broadcast use, so keeping the sensors as small as possible is desirable to maximize DOF and also to minimize system weight. All mirrorless fans note that these lenses have a long back throw to accommodate the prism.