The Lenovo S500 has an Intel Core i3-2xxx processor family which is better than most ultrabooks that are a comparable age to it. Most ultrabooks that have been around for around the same time as it have an Intel Core i5 processor family.
An Intel Core i3-2xxx processor family is in fact the worst processor family amongst all ultrabooks that have been available for a similar time to the S500.
Amongst similar types of portable PC the best processor family is Intel Core i7-3xxx.
If you are looking for a portable PC with a better processor family then you might also want to consider the Samsung 540U3C (Intel Core i3-3xxx).