Having some issues with my tomato plants. They were all looking huge, healthy, and beautiful until about a month ago. Once they put out lots of fruit, the leaves started turning yellow with brown spots. I can't tell if this is early blight, a nutritional deficiency, or something else. Thoughts? All my tomato plants are affected by seemingly the same condition, though to varying degrees. My plants are still loaded with fruit so I'm not too concerned but it seems to be getting worse. I live in southwest Washington state and it's been in the 90's the past few weeks.

Sungold Leaves ^

Sungold plant^

Stupice leaves. Not as bad, but leaves are curling and have small brown specks.

Brandywine leaf.