Yep, I think this question has been asked quite a number of times, just thought I should ask based on what I need. I'm currently using a (close to) 4 year old 550D, so I was thinking it was time for me to upgrade. I am now choosing between upgrading to either a 7D or 5D mark II (mark III is pretty out of my price range for now, so hopefully no one suggests the mark III instead).
I'm leaning quite heavily towards the 7D, because I'm really very happy with how my current crop lens is serving me quite well for basically every single purpose I use it for, be it portraits, landscapes or even the occasional sports photography like the cheerleading competition I did last week. And also I just bought a cropped aspherical lens which I haven't really gotten around to playing around with, and I'm rather reluctant to sell it without using it much. Upgrading to another crop body like the 7D would allow me to keep all these and save me the trouble of upgrading lenses together with the camera. But there's the issue of the 7D and 550D having the same sensor, I feel like I will be upgrading just for better functionality and build.
On the other hand, the 5D mark II obviously will have better image quality, but it's the thought of upgrading my lenses together with the camera that turns me off, it just feels like extra cost on top of the already more expensive 5D mark II, which I don't think be able to afford (the lenses, not the body). The only EF lens I own is the 50mm f1.8, which isn't flexible enough for my needs.
For the record, I do mainly travel-type photography and some cosplay portraits whenever there are conventions. Anything else is based on what I feel like shooting at that time. My current main lens is the Sigma 18-200mm, which I really love due to its versatility, I feel like there's nothing I can't take with this lens.
One of my ideas was to upgrade to the 7D first, then slowly phase out my crop lens and introducing FF lenses to my inventory, then make the jump to FF when I think I need another upgrade. Do you guys think this is a good idea, or should I make the direct jump to FF? My priority right now is actually cost, because I'm not really working as of now so I have no income, but its the allure of higher image quality in the 5D II that's giving me a headache. Any advice would be welcome here. Thanks a lot in advance.