Can The Sony a7s IV Save The S Lineup?

Sony was the first company to pivot to full-frame mirrorless cameras in 2013 with alpha 7 and alpha 7R. It is amazing to see how they challenged the DSLR, which was already in full swing. Perhaps they saw the trend change before anyone (Panasonic technically became the first to use mirrorless but in the Micro Four Thirds segment), which is paying them so well. The original a7 was designed for serious enthusiasts, offering 24MP resolution. A year later, a 12MP version, a hybrid camera offering 4K...