i think after reading your post and analyzing the mental status........yes you look funny..... first we never said that jf17 is superior to MKI. and remember MKI is not invisible also....and j 10 is in service and is serially produced while pak fa is under prototyping phase ( keep in mind that americans are still struggling hard for making the 5 gen fighter as a norm) so it gives a cushion of 5 to 7 years.....and if you had any clue how air warfare is fought then you wouldn't acted like a child........ FOR your brain storming i will only tell you the number of major factors in this subject..........altitude, speed of fighters , speed and direction of air , Rcs of fighters , speed and movement of misslie , Radar frequencies and its power and its ablility to judge and separate false signals with original ones, ability to concentrate its wavelength to a particular point and the angle not only horizontal but also in vertical direction and more important mode of the radar in which it is being operated..( jf 17 has more than 12 modes), flight path of fighters.........and the list goes on and on so with so many diversified factors one can say that with correct tactics and mission awareness and environmental analysis or SWOT analysis , even Mig 21 become a threat to MKi so next time i hope that my indian friends will speak with logic instead of........ so think before you say...takecare regards Azhar