I tried the sony FDR-AX53 the other day, on a tripod, and the zoom was very jerky.
I then tried the Lumix GH4 DSLR, again on a tripod, which does not have the 30 minute video limit which all other DSLRs have in the UK.
But! When I zoomed the camera did not keep the picture in focus!
I guess a camcorder is best but which one for say less than Â£2000 ?