Send Mike kelly an email. He is one of the best real estate guys ive ever seen,,,,,,,he would know whats best. He is on POTN
He shoots mostly Architecture stuff now.
Most RE photogs operate on the cheap (think $50 to $75 a home). You'll need to decide what market you're approaching, and figure out your gear needs from there.
I shoot mostly interior design stuff, and you'll find that the creative fields are likely to pay more for your work (with an equal increase in quality). Mind you, I'll spend 2 hours shooting a small kitchen; this also translates to another 8 hours in post, for a delivery of ~15 images (5 main, and 10 detail).
To paraphrase Mike Kelley: would you rather be shooting 100 homes, at $100 a pop; or 10 homes at $1000 a pop?
BUT, to answer your question:
The major advantage of full-frame in the real-estate and architectural markets, is the additional width whilst minimizing distortion.
Realistically, lighting is the biggest thing in RE photography and your money might be better spent on external flash.


