Below you can see the front view size comparison of Sony A6300 and Pentax K-S2. Sony A6300 is clearly the smaller of the two cameras. Its body is 3mm narrower, 24mm shorter and 24mm thinner than Pentax K-S2.
Sony A6300 vs Pentax K-S2 - Front View
Sony A6300 vs Pentax K-S2 - Top View
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.
Camera Size Comparison
Select Two Cameras for Size Comparison