I sold Sony a7-3 six months later and about 100 shots, spit, switched to 5d4, then bought 1dx for a beautiful picture. I used them for a year, then I bought R and no longer picked up either 1dx or 5d4, the cameras are already clearly outdated on all fronts. The 5d4 has a "digital lens optimization" function that processes each frame for about 5 seconds, which makes it impossible to use it for sequential shooting, while in R with a new processor this function works on the fly, immediately shooting optimized frames. Many will say that the function is unnecessary, but in fact, even with a 24-70 2.8 II (!!!) lens, the difference is colossal - in some cases, spherical aberration and fringing are visible on 5d4, and on EOS R - an almost perfect picture (and all this is already written in equal, and does not require further computer resources for correction). At the same time, on R, after all these corrections, the detail is even higher, which, together with precise focus, allows you to calmly crop the image 2 times after shooting
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