I have a 5D MkII and it’s an excellent camera. Granted I don’t shoot next to the sea but I shoot with a 17-40mm L and 24-105mm L now as EF-S won’t work as Jeff pointed out.
Modern cameras are cheap and plastic now, the old robust magnesium bodies went out after the 50D. As daft as it sounds, when I’m sat in the rain waiting for the Kingfisher, a sandwich bag and elastic bands works as well as you need.
In all honesty, the 700D is still more than a capable unit for what you’re doing, I’d have it professionally cleaned and in the meantime start saving for its replacement in a year or two. Aside from looking through a massive full frame viewfinder, and greater ISO, the 6D is gonna be a big investment with EF lenses
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