Ok, I took your original post you were ready to move up in body first, but maybe better lenses. As for lenses Nikon and Canon are really about the same. Both have good lenses, but also if you go by test like from DXO, Sigma has some that test better than either Nikon or Canon. And if you read the posts here, many do have Sigmas, and now Tamron G2's that they love. So, don't get stuck on having one brand.
Next, you said you don't have a price range. That is a big big mistake. You need to set a budget! You need to set budget goals when certain plateaus are met.
You really need to come up with a budget. And we can help you chose, if your in between models or lens choices.
And since your just starting off with entry level equipment. I will say this. For the money Pentax has the best performing least expensive full frame in the K-1. And their lenses are top notch and less expensive since their bodies have the IS and not the lenses. But outfits like Sigma and Tamron don't make lenses for Pentax. But for the money, Pentax K-1 is the best deal going performance wise for full frame performance.
Canon though has a big lens collection and third party support by lens makers like Sigma, Tamron, and Tokina. Basically the problem with Canon is their sensors are behind the times, except their very top end cameras. Nikon on the other hand. Their camera sensors are very good. Their entry level sensors are better than Canon's mid level and advanced cameras. If your going to have to buy lenses and body don't get locked in to who you have now with just entry level equipment. Now if you like the feel of Canon and control lay outs thats fine. But your going to have to pay more for similar performing camera in Canon than Pentax or Nikon. And then you have Sony who has several top notch performers in full frame. But again we are talking about high priced bodies and lenses.