There is a professional comparison test of the new released Sony FE 24-70mm F2.8 GM Lens and the Sony Vario-Tessar T* FE 24-70mm f/4 lens at the dcfever.com. Sony FE 24-70mm F2.8 GM is better at many aspects than the Zeiss, but it is too large and heavy and expensive.
They tested both lenses on Sony A7R II with ISO 100. You can see how well these two lenses work on the Sony A7R II.
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Sony FE 24-70mm F2.8 GM lens | check price | Amazon| B&H| Adorama| eBay |
Sony T* FE 24-70mm F4 lens | check price | Amazon| B&H| Adorama| eBay |
Source: Dcfever
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