Eugene reviews the Sony RX10 Mark IV (http://digit.re/RX10IV) in this First Shot video.
Ultra-fast AF response, (0.03 s2) up to 24fps4 with AF/AE-tracking continuous shooting, 24–600 mm7 F2.4–4 lens and Exmor RS™ sensor, all in one camera. ZEISS® Vario-Sonnar® T* 24–600 mm7 F2.4–4 large-aperture high resolution high speed zoom lens. Approx. 20.1 effective megapixel 1.0-type stacked phase-detection AF Exmor RS™ CMOS sensor with DRAM chip. BIONZ X™ image processing engine for superior detail reproduction and noise reduction. 0.03 s2 AF response with 315 focal-plane phase-detection AF points. Up to 24fps4 continuous shooting with AF/AE for up to 2495 shots