Nice pics, Bill, even for a windy day! Did you use auto focus or manual on these?
I had tried out 2 macros before I settled on the nikon 60 mm. One was the sigma 105 --I just didn't like the feel of it . . . the auto focus seemed to be really slow and cumbersome. . . seemed to be "hunting " a lot. So I tried the nikon 105 next . . . the autofocus was better, but it seemed to me to be kind of "temperamental", only way I can describe it . . . and the 105 was a little impractical for DX format. . . had to back way up to if I wanted to do non-macro . . . so I went with the 60 mm which I have been really happy with. Shot all my candid bridal shower shots and tonight's halloween party with the 60 mm. I like lenses that are versatile.
Good luck with your sigma. . . I hope it works well for you!
Best Regards