The only way to really sort this out is to do lots of reading, on sites like this, and to go to a well stocked store, if you're fortunate enough to have one in your community, and make some images. Renting is a great way to try out a new system before you spend lots of money.
I am a former large format person who loves his Nikon D800E, but who cannot (will not) carry it hiking. First I had a Panasonic GF-1 but its quality was not quite good enough, then came an Olympus OM-D, which i LOVED because of its size and the in-body stabilization. I could attach an old Leica 90mm f/2.8 Elmarit and had a stabilized, 180mm equivalent f/2.8, just remarkable. And... the image quality seemed quite good... until a friend loaned me his Fuji X E-1 for an afternoon. I was hooked. I now make 13x20 prints from my Fuji, the primes are awesome, the zoom is just great. The only thing I miss about the Olympus is the IBIS. But the high ISO performance of the Fuji is so good, I can just crank up the ISO and shoot away. I do landscape, scenics, nature, macro, some on a small tripod, some hand held. Can you tell I love it? I understand it's thought of as quirky, and I know Lloyd Chambers seems to hate it, but forget all those folks, including me, and try some of these cameras out. Try the new OM-D and the G7, the NEX, whatever. See what works for you. I've told you what works for me in more detail than you probably wanted.