Hey Clueless
I agree with Adam that if you go for primarily the 18-135 WR, it is of no real benefit for you to spend the extra money for the K-5 IIs. Very simply put, the 's' lack the AA filter so that shots are inherenty sharper, but at the risk of moire. It's a trend as of the past couple years (the K-5 II and K-5 IIs were the first APS-C DSLR's to offer the option, the Nikon D800 and D800E being the first overall and obviously for full format as well). Your D40 has an AA filter. But to really see the difference, you would need the top lenses that have good enough glass to resolve such minute sharpness and resolution at the pixel level. While I would adamantly argue it's the best kit/walkaround lens offered anywhere of any camera system, the 18-135 WR isn't sharp enough to really see the difference. For that, you need to upgrade to DA/FA Limited of DA* lenses - Pentax's professional (and pricier) line of glass.
That said, in bright daylight (which India has plenty of!), I honestly have a hard time seeing (and no one else surely notices) the difference between the 18-135 WR and my DA* glass at stopped down apertures (especially around f/8) unless I dive into the 100% pixel views.
I also agree with Adam when he says wait for Black Friday (the last Friday/weekend in November), as it's a notorious time for savings in America, and you will surely be able to score some deals.
As for recommendations, the 18-135 is certainly what I would recommend for your walkaround kit. Also to consider, though, is that Pentax just released an WR variant of the 55-300, so it might be of interest to you to do a
body +
18-55 WR +
55-300 WR, giving you 18-300mm in a weather sealed combo. The 55-300 is about the size of a 300mL coke can.
Another option would be the
body +
18-135 WR + the
DA 50 f/1.8 so you have a fast low light/portrait lens as well (sadly not WR).
You've probably noticed that I keep saying "body" and not "K-5 II". That's because it might also interest you to go to the K-50, a less robust camera with slightly lower quality in image quality (you would have to really push it to its limits to see those differences) but with slightly better video and focus peaking in its liveview mode (which the K-5 II / IIs do not have). If I were you, I would go for the K-5 II. The main reason for this is because you said you plan to keep this camera for 5+ years, so the K-5 II should be far more durable over that life span. Not to mention its shutter is ridiculously silent. I have the IIs version as well as the K-30 (same as the K-50 except for its body), and I obviosly go to the IIs most of the time. The K-30 (K-50) is a camera, whereas the K-7/K-5/K-3 series of bodies are
tools. I find the shooting experience to be far richer with them. Also, as a landscape shooter, you will come to LOVE the ISO 80 of the K-5 II - the dynamic range at that ISO is competitive with the best full frame and medium format cameras on the market.
If you take a look at the
October Deals Page, you'll notice that combination deals save lots of money. I would keep an eye out for those as the end of November rolls around.
Lastly, since you are drawn to the Pentax weather sealing aspect, I can understand if there are reservations to trust it. Trust
yours truly
Hope this helps
-Heie