Panasonic Lumix S1 review: A formidable full-framer
It might be late to the game - behind Sony and Nikon - and its Leica mount makes for massive lenses, but the S1's ability and resulting image quality make for a great new entry in the full-frame market. Whether that's enough to break up the established players, however, is a whole other question - but if you have zero allegiance then Panasonic offers just as much and often more than its contemporaries.
Full-frame image quality is excellent; Lots of potential quality and sharpness from Leica mount; Exceptional image stabilisation system; Eye AF works very well; Best-in-class OLED viewfinder; High-end video features will entice a whole new audience;
It's a big and chunky system to use; Being later to the game than the other major players may limit appeal; Leica mount means lenses are massive; Shutter and rear toggle control can be hypersensitive; Some low-light autofocus slowness/hunting;