To be honest, yes I do. You get the extra channel of amplification (7.1 vs 6.1), you get an extra 10w per channel (not a huge deal but nice to brag about), you get an extra component input (very nice to have) , you also get a higher quality dac section (192khz in the 602 vs 96 khz with the 502), you also get prologic IIx, DD EX and DTS es, 32 sound processing modes vs 9, an on screen display, composite to s-video conversion, you get 2 more digital inputs (one optical, one coaxial), you get a digital output, and you get a powered zone 2 (you can put a pair of speakers in another room and run them off of this receiver, you get a 12v trigger, and the remote, while looking very similar is much better for the 602.
Edit, forgot to mention, 602 is 7.5 lbs heavier. That is a good indicator that the higher quality machine is the 602. 7.5 lbs is a big difference and usually indicates a bigger power supply and heat sinks.