What does each of those 7 clicks represent, do you get full stop's worth of reduction in the shutter speed per click as the diaphragm closes down?

Perfectly understandable - American Greenback rules in most countries, not much different in Canada though without the 2 tier exchange rates.  Let us know when you have it and show us what it can do.

Here, in my country, our economy has always been very peculiar, unstable, and full of ups and downs. Nowadays, the official rate of exchange for the US dollar is 1 dollar = 103 AR pesos ($). This is also the rate that applies to importers. People in general are allowed to buy 200 dollars per month at this rate if they go to a Bank, but no more. But the unofficial dollar rate (what we call de “Blue dollar”) is 1 dollar = 182 AR $. This is what they give you if you go to a currency exchange house (not a Bank) and sell a dollar that you have. These are the rates for today, the 16th of September. Sony, here in my country, is saying that they are selling at the same prices as in the USA. So, at the official exchange rate, this would be, for the 28-60 lens, something as: 500 x 103 = 51.500 AR $. Sony is here selling the 28-60 for 59.000 AR $. Then, 59.000 AR $ / 182 AR $  = 324 US dollars. Therefore, if I sell 324 US dollars that I had saved, they give me 59.000 AR $ with which I can buy the lens. On the other hand, most people that are selling second hand stuff, are willing to recover part of what they paid for a product when the exchange was different and not favourable for buying imported things. Therefore, second hand stuff is not cheap in relation to new stuff nowadays (for how long, nobody knows). Sony, here, is no longer selling the 28-70 lens (at least, not for the time being). Things have not always been the same, and they might change how knows when, so this might be the right time to buy new Sony stuff (if having some savings). These are the reasons why you can’t find in North America the Sony lens at the same amount of money than me, at this particular moment. I know, difficult to understand, it is madness, and can’t last, but for the time being........ So maybe I should buy the Sony 28-60mm lens and have a native AF lens as you say, specially as they are saying it is a good kit lens. Thanks

I am not recommending either of the kit lens, the reviews on the web suggest 28-60 is a good lens how much better than 28-70 can't be seen without someone doing a head to head comparison. If you are buying your first native FE lens on a budget, the 28-60 seem like a good option and the price you have quoted for it, I am not seeing it in North America.  I have the 28-70, it was part of an A7II kit (very lightly used) with 3 oem batteries and an oem charger for basically the price of the body on consignment at a local camera store.  I don't use it much but it's always handy to have a native AF lens to grab for quick snapshots when needed.