What I find interesting about Sheffield is that it's so far south it almost isn't in Yorkshire, yet it seems to be the most thought of city when discussing the Yorkshire stereotype, which I find weird because the city is pretty much on most southern the border of the county, rather than the heart of it.
I'm from North Yorkshire and consider this to be 'real Yorkshire' (because it's the biggest part, has tons of utterly unspoiled countryside and is home to both of Yorkshire's national parks), yet most of the nation seem to still think 'Sheffield' first, which is part of south Yorkshire which is chronically urban to me!
Sheffield is so far from me that it pretty much feels like whole other region of the country, even though we're in the same county.
Those are my thoughts on Sheffield!