Best overall full-frame: Sony Alpha a7 II and Pentax K-1

The Sony a7 II and Pentax K-1 ended up in a tie, as they're both very good cameras with roughly the same price, but targeted toward different audiences. Both cameras have impressive sensors with wide dynamic range and 5-axis image stabilization. The mirrorless a7 II is more adaptable, accepting a wide range of 3rd-party lenses via adapters, and focusing many of them quickly and continuously using on-sensor phase detection. There's a growing family of high quality native E-mount lenses as well. Low light Raw performance lags behind most full-frame cameras, but the JPEG engine is one of the most intelligent we've seen in terms of sharpness and noise reduction. Despite being on the soft side, the a7 II's 1080/60p capture with a host of support tools and AF means it's a capable video camera. A high-res EVF and tilting LCD (which, sadly, is not touch-enabled) ensure you can shoot in a wide variety of conditions. While not everyone will appreciate its user experience (or short battery life), the a7 II is an attractively-priced camera for those new to full-frame.

The K-1, on the other hand, is a full-sized DSLR, which means that it has space for numerous controls and a more comfortable feel in the hand. It has a unique Cross-Tilt articulating LCD, LED lights for finding controls in the dark, dual SD card slots and a built-in GPS. Its most unique feature is Pixel Shift, which uses its sensor-shift system to capture still scenes with more detail and less noise. The camera's not very suitable for moving subjects though, due to its under-performing continuous AF system. Focus accuracy with fast lenses can also suffer, a problem inherent to DSLRs. With video capture limited to 1080/30p, a complete of lack of continuous AF and no clean HDMI output, the K-1 is not as capable a video camera as the a7 II. Another limitation is lens availability. If you have a collection of legacy Pentax glass then it's a perfect fit. If you're starting from scratch, be aware that there are just a few modern Pentax full-frame lenses, and they're both heavy and expensive.