Sony Alpha Blog : Sony 70-200mm F4 Macro G II OSS
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in blue english / en noir en français All photos , taken with Sony A7RIV & A1 and with minimal post processing are available in full size (61Mpix) in the following Flickr album suivant : Sony 7…

Marc Alhadeff reviewed the new Sony 70-200 f/4 II and compared it to the older Sony f/4, the Sony f/2.8 II and the Tamron 70-180mm f/2.8

TL;DR: The Sony f/4 II is excellent but expensive compared to the competition: the Tamron 70-180mm is sharper and 50% cheaper while being as light and compact, but its AF is not as quick as the Sony which does not suits it for sports.