Literally nobody was expecting this! Tony & Chelsea Northrup review the Sony a7 IV ($2,600 at http://sdp.io/a74) against the previous generation camera, the Sony a7 III ($1,900 at http://sdp.io/a73). They test it for portraits, sports, landscape, travel and wildlife. The new 33 megapixel full-frame mirrorless camera is a BIG upgrade in several ways, but might not be worth the money for some photographers.