Welcome.
I started digital photography with the Optio 550, must have been 2004 at a guess. I had it out of the draw the other day, still works, creaky but works.

The four you are pleased with are very nice, the water and composition of No.3 add an extra dimension to this shot, it could be a bit warmer for my taste but It's beautiful and natural looking as is.
I'm sure that for every shot any of us are happy with we all have a dozen or more also rans, either clagging up the hard drive or in the bin.

I like it, great fun.

I also prefer the 2nd image, the extra light, colour and contrast help give the image depth, the top image is comparatively flat. Both look good to my eye.

I've enjoyed them all but particularly like what you've been up to in the woods.

I've just read that the lens is not due for release until summer 2018. They don't rush into these things. I've heard folk say "Slow and steady wins the race"

It'll be interesting to see how it performs.

I have and am very happy with my K-S2 with my new favourite lens the Pentax 16-85mm. It might not have the constant f2.8 but I find it an excellent lens. I kept my eyes peeled and picked a new unboxed lens from SRS Microsystems via ebay, saved a few quid. It is certainly better than my DA18-55mm WR and a covers a great range. I also have the Pentax DA 18-135mm which gives nice looking images when viewed at standard screen size with mainly excellent centre sharpness but zoom in and you don't have to move far towards the edges to start seeing an often steep drop in sharpness, the 16-85 has a much better edge to edge performance. I also have the DA* 16-50mm, I pick up the 16-85 in preference. The one thing I can't do is compare it to the Sigma 17-50 f2.8 because I have never had it.
All the reviews I've seen rate the Pentax 16-85mm very highly as do I.

A quick heads up that this weeks competition is open for entries "Autumnal Fruitfulness" is the theme. Which I chose before seeing this weeks photo of the week,
Competitions are found under the Gallery tab.

Congratulations! A pair of lovely shots, both well done. I particularly like the reflected clouds.