PCB layout for chip antenna
You are not tuning the antenne. Since you have cut away the PCB around the antenne, it makes no sence to compare the two designs. You need to implement some kind of tuning, using a VNA to analyse the antenne and bring its impedance to match 50 ohm. 

This whitepaper from Nordic describes it in detail. http://infocenter.nordicsemi.com/pdf/nwp_017.pdf