I think there are a lot of differences between Renaissance art and artists and art and artists now.
During the Renaissance art was mostly for religious purposes and painted on the walls of buildings. So the paintings were in churches, telling a story from the bible, and including characters from religion. Now paintings and sculptures are of anything, whether it is shapes or lots of different colors. The paintings and sculptures were usuallly of people, including portraits and scenes. Art work was usually commissioned instead of painted just because the artist felt like it. It seems to me that the buildings were constructed to serve a purpose and be beautiful and interesting. I think buildings now are just built to serve a purpose and they are not particularly nice to look at.
I also think artists are not as well known and respected today as they were during the Renaissance. If you were an artist during the Renaissance then everyone in the community knew you and everyone had heard of your work. Now not everyone cares as much about art so the artists and artwork are not remembered as well.
I do think art from the Renaissance and today are similar in the fact that they are constantly changing and breaking boundaries.