Pure non-sapphire F7 GPS accuracy vs F6

Hi all,

Does anyone here upgraded from F6 to basic F7? I want to know, how much the F7 GPS is better than on F6. My runs is one half in valley, where I get very bad accuracy so I'll upgrade the F6Pro, but I don't need solar or Sapphire, I just wanted better GPS which is only on Sapphire versions.. Such a shame Garmin. I didn't find any GPS review with basic F7 vs F6.