Both Olympus 1 and Olympus XZ-2 iHS have 1/1.7-inch sized 12.0 MP resolution sensors so sensor size and resolution is not a differentiator between these two cameras.
Below you can see the 1 and XZ-2 iHS sensor size comparison.
Sensor Size and Resolution Comparison image of Olympus 1 and Olympus XZ-2 iHS Cameras
Olympus 1 and Olympus XZ-2 iHS have the same sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture.
DxOMark Sensor Scores
Both Olympus 1 and Olympus XZ-2 iHS sensors have been tested by DxoMark. DxoMark scores camera sensors for color depth (DXO Portrait), dynamic range (DXO Landscape) and low-light sensitivity (DXO Sports), and also gives them an overall score. Of the two cameras that we are comparing, 1 has scored 51, 2 points higher than XZ-2 iHS.
Model
Overall
Color Depth
Dynamic Range
Low-light ISO
Olympus 1
51
20.7 bits
11.6 Evs
179 ISO
Olympus XZ-2 iHS
49
20.4 bits
11.3 Evs
216 ISO
Sensor size sets the circle of confusion, so it drives how much depth of field each
of these bodies gives you at a given aperture. You can calculate it exactly for the
Olympus 1
or the
Olympus XZ-2 iHS ,
including hyperfocal distance.