Ok guys here is a comparison in a park I run in often. About half has medium tree cover this time of year.
http://www.mygpsfiles.com/app/#ktW3i8ts
You can see the 735 tracks are much better, even in this environment, where I would not say it is overly difficult. Interesting distance accrual was dead on at all points of the run at every point I check both watches were within 0.01 miles of each other the entire run.
Another interesting point, I had the fenix 3 using footpod instant pace and the 735 on GPS instant pace and on all times I checked they were within 5s of each other and even better, the 735 was very stable and never (when I checked) gave an untoward results.
Unfortunately I forgot my chest strap, but can say HR was within my normal range for this pace and this run at all times.
Elevation plot for 735 does not look as good as fenix 3 unsurprisingly (elevation correction was on for 735 data), but I am not sure this was transmitted to the gPX file I used in mygpsfiles, because in GC the +- elevation was 42 ft gain and 43 ft loss which is higher than f3 result (10 ft Gain 13 ft loss). I suspect better smoothing of GPS elevation will result in better results for this in the future.
