So here are three cameras with different sensor sizes, and the zoom lens that covers wide to light telephoto work.
If you like headaches, here goes: each sensor sees its lens as if it were a 35mm film camera with a 28-80mm zoom lens attached. The Q lens is f/2.8-4.5 while the others are f/3.5-5.6, so it sounds brighter - but wait, formulae available on the web can 'prove' that the equivalence is actually much closer, and it can be clearly demonstrated that ... [enough: where's my ibuprofen bottle?]
Whatever. Three cameras that can do very good things up to the limits that each sensor imposes, or that physics imposes upon them. Larger is better for the sensor, smaller is best for most camera users, and the compromises each company makes will bring different opinions into play. No reason to get a headache, really!
This is a gathering and a farewell party, as the blue Lumix G1 will be going up for sale. With the Q's arrival it will become our "talented smaller-sensor" camera, and we will become an all-Pentax family. This was shot with the K-01, so the Pentax Trifecta is in place. If I become royalty I can afford the 645D and acquire the Royal Flush, but not before.
The micro-4/3 format is quite versatile and has many things going for it. I won't bash the G1, especially as it was the first of its m4/3 kind and still serves many people very well. We needed our small cameras to be really really small - so the Q will serve us better.