I feel like this thread has run its course, not much new information, just a lot of noise.
My impression is that, like any brand, Kioti and Kubota both have a set of frame sizes, and attachments (loader, 3ph) that go with that frame size. They then put different engines in that frame.
The MX and DK frame size look to be similar, and have similar capacities on the attachments. However, Kioti use that frame down to a smaller engine than Kubota do - so you can get a DK frame with a 40hp engine, Kubota start at 55hp in the MX. So yeah, there's a price difference.
I also note that Kubota USA claim you can buy an MX5400 for $22,885, and you get 60 months interest free.
https://www.kubotausa.com/products/tractors/utility/mx-series I'm not sure what you're adding to get to a $44K price, but it can't be only a loader, probably not only a cab and loader either.
This page says a DK4210SE is $29K (
https://tractorsinfo.com/kioti-dk4210se-hc/), this page says with a cab and loader it's $35K (
https://www.orchardhillsales.net/in...ion-hydraulics-belchertown-ma-01007-10000031i). Seems similar in price to me, as always depending on options and dealer specific deals.
I'll also note we talked about the MX on the first page of this thread, on the 19th June or thereabouts. At that time you had a spreadsheet very similar to what you posted above, but at that time you had the realistic price of the MX5400 as being $35K, but for some reason compared it to the DK4710SE, and only compared the Grand L to the DK4210SE (despite the Grand L being basically the same price as the MX). Based on your own comparison at that time you had the DK4210SE at $29K (not sure how you get to that price with cab and loader), and the MX at $35K. I'd personally pay the $6K more to have 14hp more and to have a Kubota, and if cash was a problem I'd finance at 0% for 60 months. But that's just me. Not sure what has changed in pricing or your analysis in the last month and a half, but there's some element of moving goal posts there.
Bottom line, like any manufacturers, the tractors don't overlap exactly. I always say that at the low end with the Kubota BX and B, and the JD 1025. The JD sits between the two - so people will be all "the JD has better specs than the BX", my usual answer is that if you want to lift more than a BX, you can buy a B2301 for about the same price, and it's all over the JD. And people will say "that's not fair". It's never fair - the tractors aren't exactly aligned. If you want a tractor between a BX and B in size (which is a really specific size requirement...) then the JD is a great machine. If you want a Kubota, then you either want a really small machine (BX), or you want a decent set of capacities and don't mind a bit larger machine (B). However, if you want an auto-attaching mower deck that works reliably, then you want a JD.
So, if you're someone who cares about lift capacity, you compare an L60 series to a DK, and you say "the DK lifts more and weighs a lot more." You compare the MX to the DK, and you say "the MX has a lot more HP." So which is the fair comparison? No real answer to that. If you'd particularly wanted a Kubota there'd have been a Kubota that suited - there are so many models there'll be one that does what you want. Maybe the pricing is a bit different, maybe the 0% finance isn't useful to you, nothing ever matches exactly. So if you're not fussy on brand, then sure, for your exact use the Kioti makes sense. And, I think as I said at the start, one big difference I think I recall is that the Kioti has quite a bit bigger cab, which means you can put a kid in the cab with you if you want, whereas I think the Kubota you can't. But don't recall if that was the DK or another model.
Anyway, fine for you that you bought a Kioti, and excellent that you're happy. Nothing worse than buying something expensive and having buyer's remorse. But also don't be surprised that other people have different criteria than you, nor be surprised that when you post about your Kioti on a Kubota forum that people will say "there's a Kubota that'd do that." When you say "no there's not" there's going to be someone who owns an MX, or owns a Grand L, and they don't want to have buyer's remorse either. So they're going to say "no, my MX is awesome." Or "no, my Grand L is awesome." And it probably is. For them.
Anyway, done with this thread, I think it should be locked or closed or something, it's just noise right now.