With the release of the 61MP a7R IV, Sony officially raised the resolution bar, eclipsing Canon’s 50MP 5DS and 5DS R DSLRs. But according to a new report, Canon may soon reclaim that crown and re-enter the “spec wars” in a big way. According to a report at Canon Rumors, the Japanese camera giant is expected to discontinue the 5DS and 5DS R in favor of an ultra-high-megapixel full-frame mirrorless EOS R camera. CR’s source, which they did not name,…