I must say that I am now officially convinced of the side preview in Notes 8. If you size the Inbox view down to about 20% width of the screen you get a new layout for the view. The layout makes the senders name bold and puts the subject on the second line and in a lighter grey. This makes finding emails very easy for me. 90% of the time I am looking for the sender and having the name be in bold makes it a snap.
This picture below is with my resolution at 1280×1024 and as you can see I almost see the entire body of the email on the right side.