The cost difference to the better A90J series is not worth it IMO unless you have money to spare. In which case you should get the 77" I mentioned.
Not sure where you would find a A90 close to the price of a C1. It may be okay at a couple hundred bucks, but not at $1,000. That would really make you feel unhappy.
The A80 series isn't really an improvement over the LG. You get a bit better build quality, and out of the box Sony color accuracy is typically better. But, not much makes it worthwhile if spending more.