Imaging Resource posted their Panasonic S1R Field Test:

What I liked:

• Very good build quality
• Excellent electronic viewfinder
• Impressive image quality
• Reliable autofocus in most situations
• Good overall performance

What I didn’t like:

• Camera will be too large and heavy for some
• Struggles a bit with some action photography situations
• Quite expensive

The Panasonic S1R is a really good full-frame mirrorless camera. The image stabilization and reliable autofocus help make capturing high-quality images with the S1R very easy. The electronic viewfinder is excellent as well, helping to make shooting with the S1R an enjoyable experience. Further, image quality is impressive across the board. It’s not the best choice for every photographer, but for those who emphasize a well-built, rugged camera body and high-end image quality, the S1R should absolutely be considered.

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Links:
Panasonic S1R at Amazon, Adorama and BHphoto. In Europe at Calumet DE, ParkCameras, Jessops.
Panasonic S1 at Amazon, Adorama and BHphoto. In Europe at Calumet DE, ParkCameras, Jessops.
Panasonic 50mm f/1.4 S at Amazon, Adorama and BHphoto. In Europe at Calumet DE, ParkCameras, Jessops.
Panasonic 24-105mm f/4.0 S at Amazon, Adorama and BHphoto. In Europe at Calumet DE, ParkCameras, Jessops.
Panasonic 70-200mm f/4.0 S at Amazon, Adorama and BHphoto. In Europe at Calumet DE, ParkCameras, Jessops.

Preorders:
Sigma 35mm f/1.2 FE at Adorama, BHphoto.
Sigma 14-24mm f/2.8 FE at Adorama, BHphoto.
Sigma 45mm f/2.8 FE at Adorama, BHphoto.

Here are the first unboxing videos of the two new Sigma L-mount lenses: