AWS S3. Multipart Upload. Can i start downloading file until it's 100% uploaded?

Actually title was a question :) Do AWS S3 support file streaming in case if file is not 100% uploaded? Client #1 split files into small chunks and start uploading them using Multipart Upload. Client #2 start downloading them from S3. So, as result client #2 don't need to wait until client #1 has uploaded the whole file. Is it possible to do it without additional streaming server?