Tony,38 oz? I think my back and neck would ache if I carried either setup on a hike or bike ride.
I'll bet the Sony's autofocus is better, though.Just for fun, I went to my favorite enabling site, camerasize.com, and ran a simulation on the RX10 M.IV and a Pentax K-30 with a 55-300 WR lens. The Pentax combo is slightly heavier, and gives "only" 450mm FF equivalent, but the Sony is actually somewhat larger in some dimensions. Compact Camera Meter