Hashirama flinched. It was clear that his friend's visual prowess grew in a drastic amount. He was not longer a run of the mill uchiha. His power was really immense. His ability to perceive what his eyes saw was near perfect.
God? ahahahaha Madara, lets not get ahead of ourselves...we're just humans. Now, from my calculations, I think you should be able to track speeds up to 6 times yours. Thats how great your visual prowess is now. Also, your ability to see chakra, movement, etc is now much better. You're still not as good as a Byakugan user when it comes to seeing past solids or when it comes to seeing individual tenketsu and chakra paths. However, there is little information that will escape your eyes my friend.
Hashirama approached Madara in a slow step as he spoke, taking out a scroll and reading it
Now, according to this ancient scroll, the chakra drain your experiencing is significant. That is now your biggest disadvantage. When you had MS, you got a significant chakra drain and you felt damage as each turn passed and your eyes weakened. Now, with EMS, you won't feel or suffer damage and you'll be able to keep it active for longer periods of time. The chakra drain is however, much greater. So your challenge will be stamina. With EMS you should also now be able to control a Bijuu by using a very powerful genjutsu on them. It can even be done to a Jinchuriki. Its a forbidden technique Madara... Bijuu are not to be triffled with. They have feelings. Controlling them with your eyes is unnatural and wrong. So don't do it. Also, now you can use all MS abilities you had before but without reducing the length you can keep your eyes active or damaging you. And finally, the most interesting ability according to the scroll is that you should now be able to cast all and every genjutsu (normal genjutsu) without handseals, just by looking at the target. As long as you can see the target and are in range, you can cast the genjutsu without handseals. Now, which part should we test now? The usage of Genjutsu without handseals or the Doujutsu techniques?