It looks a lot like Tobacco Mosaic Virus and that is some really nasty stuff. I'm growing in what was our veggie garden and my wife has some tomatoes in another area in pots. The tomatoes have yellow and brown spotted leaves and look horrible. There is a common denominator here we bought some organic potting soil and I used a little mixed with my soil when I planted. I have friends that have grown for many years and they have no idea. The guy at the grow store said maybe magnesium deficiency and they have never seen TMV around here, Oregon Willamette valley. There is a test that can be ordered for $65 or a treatment called TMV Pro that's supposed to stop it. It won't kill it though. I planted a couple tomatoes near my plants today to see if they get it. I grew beautiful plants in this same spot last year. Hoping it isn't TMV, and I'll keep you posted. Thanks, Ken