I debated the same question a few months ago between the original Q and the Q7. This was just before the Q was priced to clear out all inventory. I found a used Q with the 01 lens. The 01 lens by itself was not readily offered. If it was, either new or used, it was very expensive. I purchased this bundle and then the blow out pricing began. That's when I got another Q but this time with the 02 lens. I sold the first used Q and this resulting in the 01 prime costing me around $50.
I have been very happy with my Q. The IQ in bright light situations is excellent although I had to admit that as a RAW shooter I do need to pump up some of the settings like contrast, saturation, etc. I'm sure the camera's JPG engine will take care of this for you. Sample images, both good and bad, from the Q/Q10 and Q7 abound on the web. Take a look and zoom in at 100%. That's where you will see the differences. Also, the field of view will be different since the Q7 has a larger sensor.
I think I will skip out on the Q7 and wait for the next generation. Hopefully the IQ will be even better! Or, maybe the camera will have an EVF.
Hey, we can all dream, right? For now I will continue saving up for extra Q lenses. That's where the value for me lies.