Difference between iPhone 4 and iPhone 5?

Why does the glass feel different on the two phones?

The iPhone 5 glass feels pretty plasticky compares to the iPhone 4 glass

Here all specs http://www.phonearena.com/news/Apple-iPhone-5-vs-iPhone-4S-vs-iPhone-4-specs-comparison_id34375

The iPhone 5 isn't actually made from glass, its made from aluminium to avoid damages since glass can be easily broken. The iPhone 4 has a a4 processer and a 5mp camera whereas the iPhone 5 has a a6 processer and a 8mp camera, it is also 4g. Also the iphone 4 doesn't have siri either and is obviously smaller than iPhone 5.

You must have some fingers there. The 4 & 5's glass is the same. Gorilla Glass. I have both phones as well & feel no difference.

The iphone 5 isn't made out of glass. Only the iphone 4 and 4s are.
The iphone 5 is much faster the 4, it also has siri which the 4 does not. It's also bigger but lighter and thinner. The iphone 4 uses the old charging port whereas the iphone 5 uses a much smaller one.
The camera on the 4 is only 5mp compared to the 5's 8mp.
Another difference is that the 5 has 4g connectivity on it which is significantly faster than 3g when using the internet etc

5 is far more advanced in every aspect compared to previous versions

IPhone 5 is made entirely from glass and aluminum and has 4" physical size.