Got rid of my Sony RX100 – will E-PM2 with kit lens address its shortcomings?

The Panasonic PZ 14-42mm looks a great option to keep the size down and I've had a look at kit deals with the PZ 14-42. Of course that means a Panasonic body rather than an Olympus, but I can get a deal with the GF5 and a PZ 14-42 lens for the same price as the Canon G15.

That would seem like a great option, but unfortunately I've been reading on Imaging Resource that there is a problem with this lens at or near it maximum telephoto length with blur.

I've done a search on this forum and can't find much talk about it, so I've started a thread on this issue to see how much of a real world issue this is.