The Sigma 28-70 F2.8 DG DN Contemporary (849 euros) is an excellent pro zoom for Sony full frame cameras. In most area it is equal to the Sigma 24-70mm F2.8 DG DN Art (1200 euros) for a much more compact size and reduced price. It even does better in term of sharpness at the short end and in term of flare resistance. The Sigma 24-70mm F2.8 DG DN Art keep the edge for sharpness at 50-70mm and for the extra 4mm at the wide end that will be required for landscape shooters. Compared to the Tamron 28-75mm F2.8 Di III RXD (750 euros) , the Sigma 28-70 F2.8 DG DN is sharper, has better background blur, better portrait rendering, better build quality and ergonomics in a little bit smaller size , lighter weight for 150 euros more only
Samyang 35mm F1.8 v.s. Sony 35mm f/1.8 Which is the Best Lens?
Adobe Camera Raw vs. Sony Imaging Edge Desktop: Which is your best bet? (Dpreview).
Sony Announces Flagship Alpha 1 Mirrorless Camera (Explora). NA-A7C Housing for Sony a7C Camera
Sony FE 12-24mm f/4 G lens review with samples (Christopher Frost)
Landscape Photography and Different Types of Natural Light (Explora).
Sony A1 vs other Sony cameras (DC.watch).
Due to production issues the lens shipment was postponed. The good news is that Sony Japan announced the lens will start shipping out on March 12th. BHphoto (Click here). says the lens will ship on April 12 but I guess this date will be updated soon with the new info.