I'm quite skeptical, not sure those chinese PV panels consider the emissions generated by the mining, shipping and recycling of those panels.

"Cheap" or "cost competitive" is irrelevant if you don't consider the carbon cost.

It is very difficult to have an accurate carbon accounting, not to mention that fossil fuels will be burned when there's no wind or sun.

The best energy/carbon ratio has always been nuclear if you make an accounting on a full year.

It's important to define on what field one would compete, because there are no moral incentives to compete on carbon emissions, and monetary cost is decorrelated from the carbon cost. It's easy to shift emissions from one place to another. Anybody can say "green energy is cheaper", and define solar panels as being green while their carbon balance sheet is not so good.