Sony RX10 IV (just serviced, six month guarantee) - 12399 | Gear Focus
Sony RX10 IV vs Panasonic Lumix FZ2500 (FZ2000) - YouTube
Panasonic Lumix DMC-FZ2500 vs Sony Cyber-shot DSC-RX10 IV Sp
Panasonic Lumix FZ1000 vs. Sony Cyber-shot RX10
Panasonic's FZ1000 II 16x superzoom targets Sony's RX10 | Engadget
Sony RX10 II Review
Panasonic FZ2500 vs Sony RX10 II Detailed Comparison - PXLMAG.com
Panasonic FZ2000 vs Sony RX10 III - What Digital Camera
Panasonic FZ2000 vs Sony RX10 III - What Digital Camera
Photographer's Guide to the Panasonic Lumix DMC-FZ2500/FZ2000: Getting the Most from Panasonic's Advanced Digital Camera - Kindle edition by White, Alexander. Arts & Photography Kindle eBooks @ Amazon.com.
Sony Cyber-shot RX10 IV review: Digital Photography Review
Panasonic FZ2000 vs Sony RX10 III Comparison Review