DxOMark published their test results of the Pentax K-1 camera. Here is heir conclusion and few comparisons with other cameras:
Boasting a robust, weather-sealed construction with some interesting features, including built-in stabilization, pixel shift image merging, and Pentax’s AA filter simulator, the Pentax K-1 offers a lot at a competitive price point. What’s more, image quality is among the best we’ve tested for full-frame interchangeable lens cameras.
If you’re looking for a high-resolution 36mp DSLR for large prints, or top-quality advertising, editorial, or wedding work, the K-1 offers slightly better dynamic range and comparable results for color and noise compared to its 36Mp rivals. Its sensor scores are a cut above similarly-priced full-frame offerings from Nikon and Canon, too. The K-1 boasts better results for dynamic range at lower ISO sensitivities compared to the Canon 6D, and very similar scores to the Nikon D750 in these categories as well. It’s also ahead for color sensitivity at lower ISOs, and despite greater resolution than both the 6D and D750, it maintains similar signal-to-noise ratios. So the K-1 is a successful first full-frame DSLR from Pentax, giving photographers looking for great image quality another camera to consider. If you’re not already heavily invested in a particular brand’s lenses and accessories, put the 36Mp Pentax K-1 on your short list.