I don't remember ever saying the OP would get better results with an E-PL2 as opposed to the K-X. I'm also not sure what you mean by DSLR quality. My Olympus E-30 is a DSLR and it shares the same size sensor as the E-PL2, so the E-PL2 must produce DSLR quality images.
I will say that I will most likely get results as good with my m4/3 camera as I could with a Pentax K-X regardless of what DXOmark states.
I suppose I can be more precise with my terminology. I was applying my statements to the OP's position -- so for dSLR, I was referring to the Pentax K-X. And typically, when I say dSLR, I mean APS-C sized sensor. Yes, there are fullframe dSLRs, there are dSLRs with smaller sensors.
I never suggested that you personally said that the PL2 would get better results than the K-X. I simply questioned.... where the OP already have a camera with extremely high image quality, apart from size, why would OP want to switch to another system that was probably a step down in image quality.
Now, in your subjective comparison, you may not see any difference. I don't know whether I'd see any difference. But those scores are a good objective measure. 500 people using 500 different cameras may have 500 different opinions, but at least the DXOmark scores are an objective standard.
Quite often..... I don't see the difference in image quality between my RX100 and my dSLR. Sometimes, I don't personally see the difference in image quality between an iphone and a Canon Mark 5D Mark iii. But I know that ultimately there is a difference in quality, though I might not perceive it every time I look at a quick snap shot.
As someone said to me in another thread, "size matters."
Assuming the same level of sensor technology, the same lens, the same setting, a larger sensor will produce better overall image quality than a smaller sensor.
In terms of pure image quality, one could expect the newest full frame camera to outperform the newest crop-dSLR, which should out-perform a 4/3rd, which should outperform the 1-inch sensors (Nikon 1, Sony RX100), which should outperform the various bridge cameras and compacts.