Since the launch of the A7 and A7R in 2013, Sony has had virtually no competition in the full-frame mirrorless space. Major players like Canon, Nikon and Panasonic were keeping their focus on other camera formats, such as APS-C, Micro Four Thirds, point-and-shoots and full-frame DSLRs. But that's all starting to change. At Photokina 2018, Panasonic introduced its first full-frame mirrorless cameras, the Lumix S1R and S1, which feature 47- and 24-megapixel sensors, respectively.
While these are still in development and likely won't launch until next year, the fact that Panasonic has finally given in and is making a full-frame mirrorless shows Sony is about to start facing some serious competition. It validates all the efforts the company's been making in that market for the past few years, leading up to the gold standard that's its latest model, the A7 III.