Can you make a feature film with an iPhone? Well, "yes" is the answer if you don't mind a slightly fuzzy-looking picture on a big screen, and if you sit far enough away, but you can certainly get a cinematic "look" if you use cinema-type techniques when you make your film, and some software to give your work its finishing touches.
Cheaper, cinematic cameras come with a cost - they tend to have Rolling Shutters, which means that rapid movement can be skewed. In the next few months, you'll be able to buy cameras with Global Shutters at all price points. This can't come soon enough, according to Phil Rhodes
There has been a lot of excitement about Arri’s new Amira camera, (featuring an Alexa sensor in something closer to a traditional ENG form factor) not least because it would appear that it could be very useful outside of its intended documentary context and it has been expected to have a much lower price tag than the Arri Alexa