How much of a difference can an extra 19MP and a newly-designed really make? Apparently, quite a bit, as you can see in this quick side-by-side comparison of JPEGs shot on the 42MP Sony a7R III and the newly released 61MP Sony a7R IV. The short comparison was created by Tony & Chelsea Northrup, who were at the announcement event in New York yesterday and were able to start testing the new full-frame mirrorless camera right away. The duo shared…