Thanks for taking a look!
I do own a Chemex. It’s pretty fantastic. Recently got into pourover, and it’s been amazing so far. By “good coffee”, I guess it does. I think there are a lot of other variables, like water quality, bean quality, water temp, etc that go into making a good cup. Not an expert, but just from what I’ve learned.
On lenses, it really depends what you want to do. The 50 1.4 is great. Maybe look into a good zoom, like a 17-55 2.8 or the 24-70.
Light-wise, it also depends on what I’m shooting. Generally, I go for nice, clean, even light, but there’s no magic formula. I also use monolights, which obviously allow for modifying a location.
I don’t think the 70D is going to be worth the upgrade. I think you might want to figure out why you need to upgrade your T2i, and then look for a body to match that. Is it better low light performance, video, or sensor size? The 70D is a great camera, but I don’t think it’s that much better than the T2i.
The 24-70 is definitely worth it. I’d also argue that your 18-200 is probably limiting you (not great low light performance, weak dof/bokeh/creaminess). If the 24-70 will break your bank, look into the 17-55 f/2.8 (also a fine lens). Good luck.