K-70 Image Quality – 24.2M effective pixels, APS-C CMOS Sensor
Faster readout speed – 6fps continuous shooting. AA-filter free sensor for high definition image. Image plane phase-matching elements are embedded on the surface which allows Hybrid AF in Live View mode.
Prime MII with New Accelerator Unit – Coupled with the new accelerator unit and Ricoh’s own processing device, the PRIME MII effectively suppresses noise and reproduces fine-detailed, color rich images even at higher ISO.
Pixel Shift Resolution with motion correction – Captures four images of the same scene by shifting the image sensor by one pixel using the SR mechanism. Each pixel captures all colors to provide high-resolution images with fine detail.
From Pentax Forums
Pentax K-70 Shutter Sounds
By Pentax Forums – A video of shutter sounds in various modes.