If Naruto could continuosly use sage mode it would be awesome and I think he will learn to take in sage chakra while moving pretty soon. However it still does not compare to the full power of the kyuubi his most powerfull attack rasenshuriken was able to knock down kyuubi but not pierce its body. The tailed beast bomb Naruto is learning is so much more powerfull he will have more strength, speed moving as fast as his father, and defence withstanding rasenshuriken, to fight Sasuke.